diff --git a/package-lock.json b/package-lock.json
index 020836a..39f904d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,18 +4,26 @@
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@@ -15493,6 +15624,11 @@
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@@ -15728,6 +15867,27 @@
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@@ -15787,6 +15947,11 @@
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@@ -15861,6 +16026,11 @@
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@@ -16087,13 +16257,6 @@
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@@ -16437,9 +16572,9 @@
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diff --git a/package.json b/package.json
index 8a3eabd..7106153 100644
--- a/package.json
+++ b/package.json
@@ -8,14 +8,15 @@
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     "react": "^17.0.2",
     "react-cookie": "^4.1.1",
     "react-dom": "^17.0.2",
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+    "react-router-dom": "^6.3.0",
     "react-scripts": "4.0.3",
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     "web-vitals": "^1.1.2"
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   "scripts": {
diff --git a/src/App.css b/src/App.css
index c4ff8ec..a527668 100644
--- a/src/App.css
+++ b/src/App.css
@@ -31,7 +31,7 @@ h2 {
 
 h3, h4, h5, h6 {
   color:#494949;
-  font-weight: 500;
+  font-weight: bold;
 }
 
 a {
@@ -339,7 +339,7 @@ a{
 }
 
 .result {
-  width: 30%;
+  /* width: 30%; */
   padding: 0.25em 0.5em;
 }
 
diff --git a/src/App.js b/src/App.js
index d16f3cb..774338e 100644
--- a/src/App.js
+++ b/src/App.js
@@ -1,4 +1,5 @@
 import React, { useState, useEffect, createContext } from "react";
+import { BrowserRouter, Route, Routes } from "react-router-dom";
 import LangFilters from "./components/LangFilters";
 import SectDropdown from "./components/SectDropdown";
 import SearchBar from "./components/SearchBar";
@@ -6,72 +7,17 @@ import SearchResult from "./components/SearchResult";
 import LightSwitch from "./components/LightSwitch";
 import axios from "axios";
 import Fuse from "fuse.js";
-import { ThemeContext, themes, swapMode } from './darkMode';
-import { useCookies } from 'react-cookie';
+import { ThemeContext, themes, swapMode } from "./darkMode";
+import { useCookies } from "react-cookie";
 
 import Default from "./components/Default";
 
 import SunImg from "./img/sun.png";
 import MoonImg from "./img/moon.png";
+import BookList from "./components/BookList";
 
 const fpb = null;
 
-// eslint-disable-next-line
-function makeBook(author, hLang, cLang, title, url) {
-  //returns a struct with basic book info (author, human language, computer language, book title, url)
-  return {
-    author: author,
-    hLang: hLang, //human language
-    cLang: cLang, //computer language
-    title: title,
-    url: url,
-  };
-}
-
-// eslint-disable-next-line
-function forEachBook(func, json) {
-  //Runs func on each section, entry, and book in json, which is a list of entries
-  if (typeof func !== "function") {
-    // eslint-disable-next-line
-    throw "ERROR in forEachBook: parameter not a fucntion";
-  }
-
-  for (const hLang in json) {
-    //for each human language
-    if (Array.isArray(hLang.sections)) {
-      //check if sections is an array
-      hLang.sections.forEach(
-        (
-          cLang //for each computer lanuage
-        ) => {
-          if (Array.isArray(cLang.entries)) {
-            //verify is entries is an array
-            cLang.entries.forEach(
-              (
-                book //for each book
-              ) => {
-                if (typeof book === "object") {
-                  //verify that book is an object
-                  func(json[hLang], cLang, book); //run the function
-                }
-              }
-            );
-          }
-        }
-      );
-    }
-  }
-}
-
-// Sorts search results by their score
-// eslint-disable-next-line
-function sortByScore(results) {
-  results.sort(function (a, b) {
-    return a.score - b.score;
-  });
-  return results;
-}
-
 function jsonToArray(json) {
   let arr = [];
   let sections = [];
@@ -112,8 +58,7 @@ function App() {
   const [loading, setLoading] = useState(true); // Determines whether to show spinner
   const [searchParams, setSearchParams] = useState({ searchTerm: "" });
   const [searchResults, setSearchResults] = useState([]);
-  const [sectionResults, setSectionResults] = useState([]);
-const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
+  const [cookies, setCookie, removeCookie] = useCookies(["lightMode"]);
 
   const [lightMode, setLightMode] = useState(true);
 
@@ -121,7 +66,6 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
   const [error, setError] = useState("");
 
   let resultsList = null; // the html string containing the search results
-  let sectionResultsList = null;
 
   const changeParameter = (param, value) => {
     // Lets a child component set the value of the search term
@@ -130,7 +74,7 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
 
   // fetches data the first time the page renders
   useEffect(() => {
-	swapMode(cookies.lightMode ? themes.lightMode : themes.darkMode)
+    swapMode(cookies.lightMode ? themes.lightMode : themes.darkMode);
     async function fetchData() {
       try {
         setLoading(true);
@@ -154,7 +98,7 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
   }, []);
 
   // fires when searchTerm changes
-   // Finds most relevant title or author
+  // Finds most relevant title or author
   // THIS IS THE MAIN SEARCH FUNCTION
   useEffect(() => {
     if (dataArray) {
@@ -177,17 +121,17 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
         if (value === null || value === "") continue;
         if (key === "lang.code" || key === "section") {
           // the '^' means it must be an exact match at the beginning
-          // this is because lang.code and section are strict filters 
+          // this is because lang.code and section are strict filters
           andQuery.push({ [key]: `^${value}` });
         }
-        if(key === "searchTerm") {
-          orQuery.push({ "author": value});
-          orQuery.push({ "title": value});
+        if (key === "searchTerm") {
+          orQuery.push({ author: value });
+          orQuery.push({ title: value });
         }
       }
       // Nest the 'or' query inside the 'and' query
       // Necessary step, a quirk with fuse.js
-      andQuery.push({$or: orQuery})
+      andQuery.push({ $or: orQuery });
       // Perform the search
       let result = fuse.search({
         $and: andQuery,
@@ -215,7 +159,7 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
           }
 
           let id = section;
-          
+
           // Some ids are in HTML tags, so this will extract that id to form proper links
           if (id.includes("<a")) {
             let x = id.match(/"(.*?)"/)[0];
@@ -251,15 +195,6 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
       result = relevantLists.concat(result);
       setSearchResults(result);
       // console.log(result);
-
-      // No longer needed as the sections aren't being used
-      // let sResults = []; // section results
-      // // Finds the most relevant sections
-      // result.forEach((entry) => {
-      //   let section = entry.item.section;
-      //   if (!sResults.includes(section)) sResults.push(section);
-      // });
-      // setSectionResults(sResults);
     }
   }, [searchParams, dataArray]);
 
@@ -276,128 +211,108 @@ const [cookies, setCookie, removeCookie] = useCookies(['lightMode']);
       searchResults.map((entry) => {
         return <SearchResult data={entry.item} />;
       });
-    // Getting rid of the section results UI renders this irrelevant
-    // sectionResultsList =
-    //   sectionResults &&
-    //   sectionResults.map((section) => {
-    //     return (
-    //       <button
-    //         onClick={() => {
-    //           changeParameter("section", section);
-    //         }}
-    //       >
-    //         {section}
-    //       </button>
-    //     );
-    //   });
   }
   return (
-
-    <div
-      className="wrapper"
-      // style={{
-      //   color: lightMode ? "black" : "white",
-      //   backgroundColor: lightMode ? "white" : "black",
-      // }}
-    >
-  		<ThemeContext.Consumer>
-		{ ({ changeTheme }) => {
-			let willBeDarkMode = (cookies.lightMode && cookies.lightMode.toLowerCase() !== "true") //whether or not we are currently light mode and will become dark mode
-			changeTheme(willBeDarkMode ? themes.light : themes.dark)
-			return (<img src={willBeDarkMode ? MoonImg : SunImg}
-			onClick = {()=>{
-							setCookie("lightMode",willBeDarkMode);
-							changeTheme(willBeDarkMode ? themes.light : themes.dark)
-							}} 
-							style={{width: "20px", height: "20px",display: "block",
-															  marginLeft: "auto"
-															  }}
-		/>)}
-		}
-		</ThemeContext.Consumer>
-      <header className="header">
-
-        <h1>
-          <a href="https://ebookfoundation.github.io/free-programming-books/" target="_blank" rel="noreferrer">
-            free-programming-books
-          </a>
-        </h1>
-
-        <p>
-          <img
-            className="emoji"
-            title=":books:"
-            alt=":books:"
-            src="https://github.githubassets.com/images/icons/emoji/unicode/1f4da.png"
-            height="20"
-            width="20"
-          />{" "}
-          Freely available programming books
-        </p>
-
-        <p className="view">
-          <a href="https://github.com/EbookFoundation/free-programming-books" target="_blank" rel="noreferrer">
-            View the Project on GitHub <small>EbookFoundation/free-programming-books</small>
-          </a>
-        </p>
-        <p>
-          Does a link not work?
-          <br />
-          <a href="https://github.com/EbookFoundation/free-programming-books/issues/" target="_blank" rel="noreferrer">
-            Report an error on GitHub
-          </a>
-        </p>
-
-        <div>
-          <SearchBar changeParameter={changeParameter} />
-          {/* Filters */}
-          <LangFilters changeParameter={changeParameter} data={data} />
-          {/* Keeping sections commented out just in case */}
-          {/* <SectDropdown
-            className="sect-drop"
-            changeParameter={changeParameter}
-            data={data}
-            value={searchParams["section"] || "allSects"}
-          /> */}
-          {/* {sectionResultsList && <h3>Suggestions based on your search</h3>}
-          <div className="search-results section-results">{sectionResultsList}</div> */}
-        </div>
-      </header>
-
-      <section className="search-results">
-        {resultsList ? (
-          <div>
-            <br />
-            <h2>Search Results</h2>
-            <ul>{resultsList}</ul>
-          </div>
-        ) : searchParams.searchTerm ? (
-          <div>
-            <br />
-            <h2>No results found.</h2>
-          </div>
-        ) : (
-          <Default />
-        )}
-      </section>
-
-      <footer>
-        <p>
-          This project is maintained by{" "}
-          <a href="https://github.com/EbookFoundation" target="_blank" rel="noreferrer">
-            EbookFoundation
-          </a>
-        </p>
-        <p>
-          <small>
-            Hosted on GitHub Pages — Theme by{" "}
-            <a href="https://github.com/orderedlist" target="_blank" rel="noreferrer">
-              orderedlist
+    <BrowserRouter>
+      <div className="wrapper">
+        <ThemeContext.Consumer>
+          {({ changeTheme }) => {
+            let willBeDarkMode = cookies.lightMode && cookies.lightMode.toLowerCase() !== "true"; //whether or not we are currently light mode and will become dark mode
+            changeTheme(willBeDarkMode ? themes.light : themes.dark);
+            return (
+              <img
+                src={willBeDarkMode ? MoonImg : SunImg}
+                onClick={() => {
+                  setCookie("lightMode", willBeDarkMode);
+                  changeTheme(willBeDarkMode ? themes.light : themes.dark);
+                }}
+                style={{ width: "20px", height: "20px", display: "block", marginLeft: "auto" }}
+              />
+            );
+          }}
+        </ThemeContext.Consumer>
+        <header className="header">
+          <h1>
+            <a href="/free-programming-books-search/">
+              free-programming-books
             </a>
-          </small>
-        </p>
-      </footer>
-    </div>
+          </h1>
+
+          <p>
+            <img
+              className="emoji"
+              title=":books:"
+              alt=":books:"
+              src="https://github.githubassets.com/images/icons/emoji/unicode/1f4da.png"
+              height="20"
+              width="20"
+            />{" "}
+            Freely available programming books
+          </p>
+
+          <p className="view">
+            <a href="https://github.com/EbookFoundation/free-programming-books" target="_blank" rel="noreferrer">
+              View the Project on GitHub <small>EbookFoundation/free-programming-books</small>
+            </a>
+          </p>
+          <p>
+            Does a link not work?
+            <br />
+            <a
+              href="https://github.com/EbookFoundation/free-programming-books/issues/"
+              target="_blank"
+              rel="noreferrer"
+            >
+              Report an error on GitHub
+            </a>
+          </p>
+
+          <div>
+            <SearchBar changeParameter={changeParameter} />
+            <LangFilters changeParameter={changeParameter} data={data} langCode={searchParams["lang.code"]} />
+          </div>
+        </header>
+
+        <section className="search-results">
+          {resultsList ? (
+            <div>
+              <br />
+              <h2>Search Results</h2>
+              <ul>{resultsList}</ul>
+            </div>
+          ) : searchParams.searchTerm ? (
+            <div>
+              <br />
+              <h2>No results found.</h2>
+            </div>
+          ) : (
+            <Routes>
+              <Route path="/free-programming-books-search" element={<Default />} />
+              <Route
+                path="/free-programming-books-search/books/:lang"
+                element={<BookList changeParameter={changeParameter} />}
+              />
+            </Routes>
+          )}
+        </section>
+        <footer>
+          <p>
+            This project is maintained by{" "}
+            <a href="https://github.com/EbookFoundation" target="_blank" rel="noreferrer">
+              EbookFoundation
+            </a>
+          </p>
+          <p>
+            <small>
+              Hosted on GitHub Pages — Theme by{" "}
+              <a href="https://github.com/orderedlist" target="_blank" rel="noreferrer">
+                orderedlist
+              </a>
+            </small>
+          </p>
+        </footer>
+      </div>
+    </BrowserRouter>
   );
 }
 
diff --git a/src/components/BookList.js b/src/components/BookList.js
new file mode 100644
index 0000000..caea467
--- /dev/null
+++ b/src/components/BookList.js
@@ -0,0 +1,39 @@
+import React, { useEffect, useState } from "react";
+import ReactMarkdown from "react-markdown";
+import axios from "axios";
+import { useParams } from "react-router-dom";
+import rehypeSlug from 'rehype-slug'
+
+function BookList({changeParameter}) {
+  let [markdown, setMarkdown] = useState(null);
+  const [loading, setLoading] = useState(true);
+  let params = useParams();
+
+  useEffect(() => {
+    changeParameter('lang.code', params.lang);
+  }, [params.lang]);
+    
+
+  useEffect(() => {
+    async function fetchData() {
+      try {
+        setLoading(true);
+        let result = await axios.get(
+          `https://raw.githubusercontent.com/EbookFoundation/free-programming-books/main/books/free-programming-books-${params.lang}.md`
+        );
+        setMarkdown(result.data);
+      } catch (e) {
+        console.log("Couldn't get data. Please try again later")
+      }
+      setLoading(false);
+    }
+    fetchData();
+  }, []);
+  if(loading){
+      return <p>Loading...</p>
+  }
+  console.log(markdown);
+  return <section><ReactMarkdown children={markdown} rehypePlugins={[rehypeSlug]} /></section>;
+}
+
+export default BookList;
diff --git a/src/components/Default.js b/src/components/Default.js
index a3140b2..c1681a7 100644
--- a/src/components/Default.js
+++ b/src/components/Default.js
@@ -69,6 +69,135 @@ function Default() {
         </li>
       </ul>
 
+      <h2 id="resources">Resources</h2>
+
+      <p>This project lists books and other resources grouped by genres:</p>
+
+      <h3 id="books">Books</h3>
+
+      <p>
+        <a href="/free-programming-books-search/books/langs/">English, By Programming Language</a>
+      </p>
+
+      <p>
+        <a href="/free-programming-books-search/books/subjects/">English, By Subject</a>
+      </p>
+      <h4 id="other-languages">Other Languages</h4>
+
+      <ul>
+        <li>
+          <a href="/free-programming-books-search/books/ar/">Arabic / al arabiya / العربية</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/az/">Azerbaijani / Азәрбајҹан дили / آذربايجانجا ديلي</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/bn/">Bengali / বাংলা</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/bg/">Bulgarian / български</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/my/">Burmese / မြန်မာဘာသာ</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/zh/">Chinese / 中文</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/cs/">Czech / čeština / český jazyk</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/dk/">Danish / dansk</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/nl/">Dutch / Nederlands</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/et/">Estonian / eesti keel</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/fi/">Finnish / suomi / suomen kieli</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/fr/">French / français</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/de/">German / Deutsch</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/el/">Greek / ελληνικά</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/he/">Hebrew / עברית</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/hi/">Hindi / हिन्दी</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/hu/">Hungarian / magyar / magyar nyelv</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/id/">Indonesian / Bahasa Indonesia</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/it/">Italian / italiano</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/ja/">Japanese / 日本語</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/ko/">Korean / 한국어 [韓國語]</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/no/">Norwegian / Norsk</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/fa_IR/">Persian / Farsi (Iran) / فارسى</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/pl/">Polish / polski / język polski / polszczyzna</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/pt_BR/">Portuguese (Brazil)</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/pt_PT/">Portuguese (Portugal)</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/ro/">Romanian (Romania) / limba română / român</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/ru/">Russian / Русский язык</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/sr/">Serbian / српски језик / srpski jezik</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/sk/">Slovak / slovenčina</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/es/">Spanish / español / castellano</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/sv/">Swedish / Svenska</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/ta/">Tamil / தமிழ்</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/th/">Thai / ไทย</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/tr/">Turkish / Türkçe</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/uk/">Ukrainian / Українська</a>
+        </li>
+        <li>
+          <a href="/free-programming-books-search/books/vi/">Vietnamese / Tiếng Việt</a>
+        </li>
+      </ul>
+
       <h2 id="translations">Translations</h2>
 
       <p>
diff --git a/src/components/LangFilters.js b/src/components/LangFilters.js
index 0dfc5af..33695a5 100644
--- a/src/components/LangFilters.js
+++ b/src/components/LangFilters.js
@@ -1,6 +1,6 @@
 import React, { useState, useEffect } from "react";
 
-function LangFilters({ changeParameter, data }) {
+function LangFilters({ changeParameter, data, langCode }) {
   const [languages, setLanguages] = useState([]);
   const [selected, setSelected] = useState("");
   const [showFilters, setShow] = useState(false);
@@ -11,6 +11,10 @@ function LangFilters({ changeParameter, data }) {
     setSelected(e.target.value);
   };
 
+  useEffect(() => {
+    setSelected(langCode);
+  }, [langCode]);
+
   useEffect(
     // run whenever data changes
     () => {
@@ -60,7 +64,14 @@ function LangFilters({ changeParameter, data }) {
   let filterList = (
     <form className="filters">
       <label>
-        <input type="radio" key="all" className="sect-select" value="" onChange={handleChange} checked={"" == selected} />
+        <input
+          type="radio"
+          key="all"
+          className="sect-select"
+          value=""
+          onChange={handleChange}
+          checked={"" == selected}
+        />
         All Languages
       </label>
       {options}
@@ -71,7 +82,7 @@ function LangFilters({ changeParameter, data }) {
     <div className="langFilters">
       <div className="filterHeader">
         <h3>Filter by Language</h3>
-        <button onClick={() => setShow(!showFilters)}>{showFilters? "-" : "+"}</button>
+        <button onClick={() => setShow(!showFilters)}>{showFilters ? "-" : "+"}</button>
       </div>
       {showFilters ? filterList : ""}
     </div>
diff --git a/src/fpb.json b/src/fpb.json
deleted file mode 100644
index 1f069e4..0000000
--- a/src/fpb.json
+++ /dev/null
@@ -1,21092 +0,0 @@
-{
-   "type": "root",
-   "children": [
-      {
-         "type": "fpb",
-         "index": {},
-         "children": [
-            {
-               "language": {
-                  "code": "ar",
-                  "name": "Arabic"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "Arduino",
-                     "entries": [
-                        {
-                           "url": "http://librebooks.org/simply-arduino/",
-                           "title": "أردوينو السهل"
-                        },
-                        {
-                           "url": "http://www.ev-center.com/uploads/2/1/2/6/21261678/arduino.pdf",
-                           "title": "كتاب احترف الأردوينو"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Artificial Intelligence",
-                     "entries": [
-                        {
-                           "url": "https://academy.hsoub.com/files/17-%D9%85%D8%AF%D8%AE%D9%84-%D8%A5%D9%84%D9%89-%D8%A7%D9%84%D8%B0%D9%83%D8%A7%D8%A1-%D8%A7%D9%84%D8%A7%D8%B5%D8%B7%D9%86%D8%A7%D8%B9%D9%8A-%D9%88%D8%AA%D8%B9%D9%84%D9%85-%D8%A7%D9%84%D8%A2%D9%84%D8%A9/",
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-                           "url": "https://www.mobarmijoun.com/2014/04/c_19.html",
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-                           "url": "https://academy.hsoub.com/files/13-نحو-فهم-أعمق-لتقنيات-html5/",
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-                           "url": "https://alyassen.github.io/Brief-guide-to-programming-languages-v1.2.4.pdf",
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-                           "url": "https://rabahboudia.gitbooks.io/arabic-eloquent-js/content/index.html",
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-                     "section": "Linux",
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-                           "url": "http://librebooks.org/gnu-linux-advanced-administration/",
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-                        },
-                        {
-                           "url": "http://librebooks.org/simply-ubuntu/",
-                           "title": "أوبنتو السهل"
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-                           "url": "http://librebooks.org/debian-handbook-arabic/",
-                           "title": "دفتر مدير دبيان"
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-                           "url": "http://librebooks.org/digital-freedoms-main-concepts/",
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-                           "url": "http://librebooks.org/opensource-ultimate-options/",
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-                           "url": "http://librebooks.org/know-free-software/",
-                           "title": "تعرف على البرمجيات الحرة"
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-                           "url": "http://librebooks.org/free-opensource-guide/",
-                           "title": "دليل البرمجيات الحرة مفتوحة"
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-                           "url": "http://librebooks.org/bref-about-foss-licenses/",
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-                           "url": "http://librebooks.org/intro-to-os-analysis-and-design/",
-                           "title": "المقدمة في تحليل وتصميم أنظمة"
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-                     "section": "PHP",
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-                           "url": "http://librebooks.org/learn-programming-with-php/",
-                           "title": "تعلم البرمجة بلغة PHP"
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-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/ar/index.html",
-                                 "title": "سيمفوني 5 : المسار السريع"
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-                           "url": "http://www.ev-center.com/uploads/2/1/2/6/21261678/scratch.pdf",
-                           "title": "كتاب احترف سكراتش"
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-                           "url": "https://academy.hsoub.com/files/15-البرمجة-بلغة-بايثون/",
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-                           "url": "https://www.ev-center.com/uploads/2/1/2/6/21261678/كتاب_احترف_الرازبيري_باي.pdf",
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-                           "url": "http://librebooks.org/simply-raspberry-pi/",
-                           "title": "راسبيري باي السهل"
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-                     "entries": [
-                        {
-                           "url": "http://librebooks.org/intro-to-ruby/",
-                           "title": "مقدمة في روبي"
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-                        {
-                           "url": "http://librebooks.org/secure-wireless-networks-for-home-users/",
-                           "title": "تأمين الشبكات اللاسلكية للمستخدم المنزلي"
-                        },
-                        {
-                           "url": "http://librebooks.org/physical-hacking-techniques/",
-                           "title": "تقنيات الاختراق المادي"
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-                        {
-                           "url": "https://academy.hsoub.com/files/20-%D8%AF%D9%84%D9%8A%D9%84-%D8%A7%D9%84%D8%A3%D9%85%D8%A7%D9%86-%D8%A7%D9%84%D8%B1%D9%82%D9%85%D9%8A/",
-                           "title": "دليل الأمان الرقمي"
-                        },
-                        {
-                           "url": "http://librebooks.org/security-in-a-box/",
-                           "title": "عُدَّة الأمان الرقمي"
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-                     "section": "SEO",
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-                        {
-                           "url": "http://librebooks.org/search-engine-optimization-seo-starter-guide-ar/",
-                           "title": "تحسين محركات البحث SEO - دليل المبتدئين"
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-                           "url": "https://academy.hsoub.com/files/16-%D9%85%D9%84%D8%A7%D8%AD%D8%B8%D8%A7%D8%AA-%D9%84%D9%84%D8%B9%D8%A7%D9%85%D9%84%D9%8A%D9%86-%D8%A8%D9%84%D8%BA%D8%A9-sql/",
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-                              {
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-                     "section": "UI/UX",
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-                           "url": "https://academy.hsoub.com/files/11-مدخل-إلى-تجربة-المستخدم-user-experience-ux/",
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-                           "url": "http://ilkaddimlar.com/ders/c-proqramlasdirma-dili",
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-                           "url": "https://programirane.org/download-now",
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-                           "url": "https://www.progstarter.com/index.php?option=com_content&view=article&id=8&Itemid=121&lang=bg",
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-                           "url": "https://introprogramming.info/intro-csharp-book",
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-                           "url": "https://www.devbg.org/dotnetbook",
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-                           "url": "https://nakov.com/books/signatures",
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-                           "url": "https://js-book.softuni.bg",
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-                              {
-                                 "url": "http://i.iinfo.cz/files/root/k/Zaklady_algorimizace.pdf",
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-                                 "url": "http://www.root.cz/knihy/regularni-vyrazy/",
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-                           "url": "http://www.root.cz/knihy/ucebnice-abclinuxu/",
-                           "title": "Učebnice ABCLinuxu"
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-                                 "url": "http://www.root.cz/knihy/gentoo-handbook-cesky/",
-                                 "title": "Gentoo Handbook česky"
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-                              {
-                                 "url": "http://www.root.cz/knihy/instalace-a-konfigurace-debian-linuxu/",
-                                 "title": "Instalace a konfigurace Debian Linuxu"
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-                              {
-                                 "url": "http://www.root.cz/knihy/mandriva-linux-2008-cz/",
-                                 "title": "Mandriva Linux 2008 CZ"
-                              },
-                              {
-                                 "url": "http://www.root.cz/knihy/prirucka-uzivatele-fedora-17/",
-                                 "title": "Příručka uživatele Fedora 17"
-                              },
-                              {
-                                 "url": "http://www.root.cz/knihy/suse-linux-uzivatelska-prirucka/",
-                                 "title": "SUSE Linux: uživatelská příručka"
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-                           "url": "http://www.root.cz/knihy/katedrala-a-trziste/",
-                           "title": "Katedrála a tržiště"
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-                           "url": "https://knihy.nic.cz",
-                           "title": "Tvorba open source softwaru"
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-                           "url": "http://www.kosek.cz/php/php-tvorba-interaktivnich-internetovych-aplikaci.pdf",
-                           "title": "PHP Tvorba interaktivních internetových aplikací"
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-                           "url": "http://diveintopython3.py.cz/index.html",
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-                           "url": "http://i.iinfo.cz/files/root/k/Ucebnice_jazyka_Python.pdf",
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-                           "entries": [
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-                                 "url": "https://tutorial.djangogirls.org/cs/",
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-                           "url": "http://i.iinfo.cz/files/root/k/Ruby_tutorial.pdf",
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-                           "url": "http://www.root.cz/knihy/prvni-setkani-s-texem/",
-                           "title": "První setkání s TeXem"
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-                        {
-                           "url": "http://www.root.cz/knihy/texbook-naruby/",
-                           "title": "TeXbook naruby"
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-                           "url": "http://www.root.cz/knihy/webova-rezie-zaklady-koncepcniho-mysleni-u-webovych-projektu/",
-                           "title": "Webová režie: základy koncepčního myšlení u webových projektů"
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-                     "section": "XML",
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-                           "url": "http://www.root.cz/knihy/xml-pro-kazdeho/",
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-                     "entries": [
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/einstieg_in_abap",
-                           "title": "Einstieg in ABAP"
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-                           "url": "https://github.com/SAP/styleguides/blob/master/clean-abap/CleanABAP_de.md",
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-                     "entries": [
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-                           "url": "http://openbook.rheinwerk-verlag.de/actionscript",
-                           "title": "ActionScript 1 und 2"
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-                           "url": "http://openbook.rheinwerk-verlag.de/actionscript_einstieg",
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-                     "entries": [
-                        {
-                           "url": "https://www.uni-trier.de/fileadmin/urt/doku/android/android.pdf",
-                           "title": "Einführung in die Entwicklung von Apps für Android 8"
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-                     "entries": [
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-                           "url": "http://drpaulcarter.com/pcasm",
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-                           "url": "https://de.wikibooks.org/wiki/C-Programmierung",
-                           "title": "C-Programmierung"
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-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/c_von_a_bis_z",
-                           "title": "C von A bis Z"
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-                        {
-                           "url": "http://www.tobscore.com/socket-programmierung-in-c",
-                           "title": "Socket Programmierung in C"
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-                        {
-                           "url": "https://web.archive.org/web/20190214185910/http://www.asc.tuwien.ac.at/~eprog/download/schmaranz.pdf",
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-                     "entries": [
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-                           "url": "http://www.highscore.de/csharp/einfuehrung",
-                           "title": "Programmieren in C#: Einführung"
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-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/visual_csharp",
-                           "title": "Visual C# 2008"
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-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/visual_csharp_2010",
-                           "title": "Visual C# 2010"
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-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/visual_csharp_2012",
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-                        {
-                           "url": "http://dieboostcppbibliotheken.de",
-                           "title": "Die Boost C++ Bibliotheken"
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-                        {
-                           "url": "https://www.assets.dpunkt.de/openbooks/Openbook_Lean_Testing.pdf",
-                           "title": "Lean Testing für C++-Programmierer (2018)"
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-                        {
-                           "url": "http://www.highscore.de/cpp/aufbau",
-                           "title": "Programmieren in C++: Aufbau"
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-                        {
-                           "url": "http://www.highscore.de/cpp/einfuehrung",
-                           "title": "Programmieren in C++: Einführung"
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-                     "entries": [
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-                           "url": "http://karlheinz-hug.de/informatik/buch/Karlheinz-Hug_Module-Klassen-Vertraege.pdf",
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-                     "section": "Git",
-                     "entries": [
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-                           "url": "http://gitbu.ch",
-                           "title": "Das Git-Buch"
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-                        {
-                           "url": "http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/de",
-                           "title": "Git Magic"
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-                        {
-                           "url": "https://git-scm.com/book/de/current",
-                           "title": "Pro Git"
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-                           "url": "http://www.bitloeffel.de/DOC/golang/effective_go_de.html",
-                           "title": "Effektiv Go Programmieren"
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-                           "url": "https://go-tour-de.appspot.com/welcome/1",
-                           "title": "Eine Tour durch Go"
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-                        {
-                           "url": "https://astaxie.gitbooks.io/build-web-application-with-golang/content/de",
-                           "title": "Erstelle Webanwendungen mit Go"
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-                        {
-                           "url": "https://github.com/Aaronmacaron/the-little-go-book-de",
-                           "title": "The Little Go Book"
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-                     "entries": [
-                        {
-                           "url": "http://examples.oreilly.de/openbooks/pdf_groovyger.pdf",
-                           "title": "Groovy für Java-Entwickler"
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-                           "url": "http://www.peterkropff.de/site/css/css.htm",
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-                        {
-                           "url": "http://www.peterkropff.de/site/html/html.htm",
-                           "title": "HTML"
-                        },
-                        {
-                           "url": "http://webkompetenz.wikidot.com/docs:html-handbuch",
-                           "title": "HTML5-Handbuch"
-                        },
-                        {
-                           "url": "https://wiki.selfhtml.org/wiki/Startseite",
-                           "title": "Self HTML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "iOS",
-                     "entries": [
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/apps_programmieren_fuer_iphone_und_ipad",
-                           "title": "Apps programmieren für iPhone und iPad"
-                        },
-                        {
-                           "url": "http://examples.oreilly.de/openbooks/iosrecipesger.zip",
-                           "title": "iOS-Rezepte"
-                        },
-                        {
-                           "url": "http://examples.oreilly.de/openbooks/pdf_ipadprogpragger.pdf",
-                           "title": "iPad-Programmierung"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://bsd.de/e3fu/umfrage.html",
-                           "title": "EJB 3 für Umsteiger: Neuerungen und Änderungen gegenüber dem EJB-2.x-Standard"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/java7",
-                           "title": "Java 7 Mehr als eine Insel"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/javainsel",
-                           "title": "Java ist auch eine Insel"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/java8",
-                           "title": "Java SE 8 Standard-Bibliothek"
-                        },
-                        {
-                           "url": "http://www.highscore.de/java/aufbau",
-                           "title": "Programmieren Java: Aufbau"
-                        },
-                        {
-                           "url": "http://www.highscore.de/java/einfuehrung",
-                           "title": "Programmieren Java: Einführung"
-                        },
-                        {
-                           "url": "http://www.frankwestphal.de/ftp/Westphal_Testgetriebene_Entwicklung.pdf",
-                           "title": "Testgetriebene Entwicklung mit JUnit & FIT"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://www.peterkropff.de/site/javascript/javascript.htm",
-                           "title": "JavaScript"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/javascript_ajax",
-                           "title": "JavaScript und AJAX"
-                        },
-                        {
-                           "url": "http://www.highscore.de/javascript",
-                           "title": "Webseiten erstellen mit Javascript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "React",
-                           "entries": [
-                              {
-                                 "url": "https://lernen.react-js.dev",
-                                 "title": "React lernen und verstehen"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://www.fernuni-hagen.de/imperia/md/content/zmi_2010/a026_latex_einf.pdf",
-                           "title": "LaTeX - eine Einführung und ein bißchen mehr..."
-                        },
-                        {
-                           "url": "http://www.fernuni-hagen.de/imperia/md/content/zmi_2010/a027_latex_fort.pdf",
-                           "title": "LaTeX - Forteschrittene Anwendungen (oder: Neues von den Hobbits)"
-                        },
-                        {
-                           "url": "http://www.lehmanns.de/page/latexreferenz",
-                           "title": "LaTeX : Referenz der Umgebungen, Makros, Längen und Zähler"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Mathematik",
-                     "entries": [
-                        {
-                           "url": "http://www.loria.fr/~zimmerma/sagebook/CalculDeutsch.pdf",
-                           "title": "Calcul mathématique avec SAGE"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Meta-Lists",
-                     "entries": [
-                        {
-                           "url": "https://www.rheinwerk-verlag.de/openbook",
-                           "title": "Galileo Computing - openbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "http://www.peterkropff.de/site/mysql/mysql.htm",
-                           "title": "MySQL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Neo4j",
-                     "entries": [
-                        {
-                           "url": "https://neo4j.com/neo4j-graphdatenbank-book",
-                           "title": "Neo4j 2.0 – Eine Graphdatenbank für alle"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://www.peterkropff.de/site/php/php.htm",
-                           "title": "PHP"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/php_pear",
-                           "title": "PHP PEAR"
-                        },
-                        {
-                           "url": "http://examples.oreilly.de/openbooks/pdf_einmysql2ger.pdf",
-                           "title": "Praktischer Einstieg in MySQL mit PHP"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/de/index.html",
-                                 "title": "Symfony 5: Auf der Überholspur"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://sourceforge.net/projects/abop-german.berlios/files",
-                           "title": "A Byte of Python - Einführung in Python"
-                        },
-                        {
-                           "url": "http://www.mschimmels.de/eigeneDateien/Python-Kurs.pdf",
-                           "title": "Einführung in Python"
-                        },
-                        {
-                           "url": "http://opentechschool.github.io/python-beginners/de",
-                           "title": "Programmiereinführung mit Python"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/python",
-                           "title": "Python 3 - Das umfassende Handbuch"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/de",
-                                 "title": "Django Girls Tutorial"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Ruby on Rails",
-                     "entries": [
-                        {
-                           "url": "http://www.oreilly.de/german/freebooks/rubybasger/pdf_rubybasger.pdf",
-                           "title": "Praxiswissen Ruby"
-                        },
-                        {
-                           "url": "http://examples.oreilly.de/openbooks/pdf_rubyonrailsbasger.pdf",
-                           "title": "Praxiswissen Ruby On Rails"
-                        },
-                        {
-                           "url": "http://examples.oreilly.de/openbooks/pdf_railsckbkger.pdf",
-                           "title": "Rails Kochbuch"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/ruby_on_rails/",
-                           "title": "Ruby on Rails 2"
-                        },
-                        {
-                           "url": "http://ruby-auf-schienen.de/3.2/",
-                           "title": "Ruby on Rails 3.2 für Ein-, Um- und Quereinsteiger"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scilab",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20161204131517/http://buech-gifhorn.de/scilab/Einfuehrung.pdf",
-                           "title": "Einführung in Scilab/Xcos 5.4"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "http://eis.ph-noe.ac.at/kreativeinformatik",
-                           "title": "Kreative Informatik mit Scratch"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "UML",
-                     "entries": [
-                        {
-                           "url": "http://www.highscore.de/uml",
-                           "title": "Der moderne Softwareentwicklungsprozess mit UML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Unabhängig von der Programmiersprache",
-                     "entries": [
-                        {
-                           "url": "http://clean-code-developer.de",
-                           "title": "Clean Code Developer: Eine Initiative für mehr Professionalität in der Softwareentwicklung"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/it_handbuch",
-                           "title": "IT-Handbuch für Fachinformatiker"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/oop",
-                           "title": "Objektorientierte Programmierung"
-                        },
-                        {
-                           "url": "https://res.infoq.com/news/2007/06/scrum-xp-book/en/resources/ScrumAndXpFromTheTrenchesonline_German.pdf",
-                           "title": "Scrum und XP im harten Projektalltag"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Unix",
-                     "entries": [
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/linux_unix_programmierung",
-                           "title": "Linux-UNIX-Programmierung"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/shell_programmierung",
-                           "title": "Shell-Programmierung"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/unix_guru",
-                           "title": "Wie werde ich Unix Guru?"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "VHDL",
-                     "entries": [
-                        {
-                           "url": "https://de.wikibooks.org/wiki/VHDL-Tutorium",
-                           "title": "VHDL-Tutorium"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Visual Basic",
-                     "entries": [
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/einstieg_vb_2010",
-                           "title": "Einstieg in Visual Basic 2010"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/einstieg_vb_2012",
-                           "title": "Einstieg in Visual Basic 2012"
-                        },
-                        {
-                           "url": "http://openbook.rheinwerk-verlag.de/visualbasic_2008",
-                           "title": "Visual Basic 2008"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": ""
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://people.cs.aau.dk/~normark/c-prog-06/pdf/all.pdf",
-                           "title": "Programmering i C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "http://people.cs.aau.dk/~normark/oop-csharp/pdf/all.pdf",
-                           "title": "Object-oriented Programming in C#"
-                        },
-                        {
-                           "url": "http://people.cs.aau.dk/~normark/ap/index.html",
-                           "title": "Notes about C++"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://javabog.dk",
-                           "title": "Objektorienteret programmering i Java"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Pascal",
-                     "entries": [
-                        {
-                           "url": "http://people.cs.aau.dk/~normark/all-basis-97.pdf",
-                           "title": "Programmering i Pascal"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "en",
-                  "name": "English"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "All",
-                     "entries": [
-                        {
-                           "url": "free-programming-books.md",
-                           "title": "English"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "es",
-                  "name": "Spanish, Castilian"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "0 - Meta-Listas",
-                     "entries": [
-                        {
-                           "url": "https://wiki.python.org.ar/aprendiendopython/",
-                           "title": "Aprender Python"
-                        },
-                        {
-                           "url": "http://jorgesanchez.net",
-                           "title": "Apuntes Completos de Desarrollo Web"
-                        },
-                        {
-                           "url": "https://github.com/ddd-espanol/asombroso-ddd",
-                           "title": "Asombroso DDD: Una lista curada de recursos sobre Domain Driven Design"
-                        },
-                        {
-                           "url": "https://github.com/statickidz/TemarioDAW#temario-daw",
-                           "title": "Desarrollo de Aplicaciones Web - Temario Completo"
-                        },
-                        {
-                           "url": "https://javiergarciaescobedo.es",
-                           "title": "Desarrollo de Aplicaciones Web y Sistemas Microinformáticos y Redes"
-                        },
-                        {
-                           "url": "https://github.com/DpdC/gitbook-biblioteca-impresionante-en-espanol#gitbook---biblioteca-de-libros-en-español--",
-                           "title": "Gitbook - Libros útiles en español"
-                        },
-                        {
-                           "url": "http://elvex.ugr.es",
-                           "title": "Múltiples Cursos y Enlaces de Tecnología Informática"
-                        },
-                        {
-                           "url": "https://openlibra.com/es/collection",
-                           "title": "OpenLibra - Biblioteca recopilatorio de libros libres"
-                        },
-                        {
-                           "url": "http://fcasua.contad.unam.mx/apuntes/interiores/plan2016_1.php",
-                           "title": "Universidad Autónoma de México - Plan (2016)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "1 - Agnósticos",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Algoritmos y Estructuras de Datos",
-                           "entries": [
-                              {
-                                 "url": "http://www.eduteka.org/pdfdir/AlgoritmosProgramacion.pdf",
-                                 "title": "Algoritmos y Programación (Guía para docentes)"
-                              },
-                              {
-                                 "url": "https://openlibra.com/en/book/download/apuntes-de-algoritmos-y-estructuras-de-datos",
-                                 "title": "Apuntes de Algoritmos y Estructuras de Datos"
-                              },
-                              {
-                                 "url": "http://lya.fciencias.unam.mx/jloa/publicaciones/analisisdeAlgoritmos.pdf",
-                                 "title": "Breves Notas sobre Análisis de Algoritmos"
-                              },
-                              {
-                                 "url": "http://informatica.uv.es/docencia/fguia/TI/Libro/Libro_Fundamentos_Inform_Program.htm",
-                                 "title": "Fundamentos de Informática y Programación"
-                              },
-                              {
-                                 "url": "https://es.wikibooks.org/wiki/Fundamentos_de_programaci%C3%B3n",
-                                 "title": "Fundamentos de programación"
-                              },
-                              {
-                                 "url": "https://es.wikibooks.org/wiki/Introducci%C3%B3n_a_la_Programaci%C3%B3n",
-                                 "title": "Introducción a la programación"
-                              },
-                              {
-                                 "url": "http://lya.fciencias.unam.mx/jloa/publicaciones/estructurasdeDatos.pdf",
-                                 "title": "Temas selectos de estructuras de datos"
-                              },
-                              {
-                                 "url": "http://www.bubok.es/libros/219288/Teoria-sintacticogramatical-de-objetos",
-                                 "title": "Teoría sintáctico-gramatical de objetos"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Base de Datos",
-                           "entries": [
-                              {
-                                 "url": "http://rua.ua.es/dspace/bitstream/10045/2990/1/ApuntesBD1.pdf",
-                                 "title": "Apuntes de Base de Datos 1"
-                              },
-                              {
-                                 "url": "http://www.uoc.edu/masters/oficiales/img/913.pdf",
-                                 "title": "Base de Datos (2005)"
-                              },
-                              {
-                                 "url": "https://openlibra.com/es/book/download/bases-de-datos-2",
-                                 "title": "Base de Datos (2011)"
-                              },
-                              {
-                                 "url": "https://openlibra.com/es/book/download/bases-de-datos-avanzadas",
-                                 "title": "Base de Datos Avanzadas (2013)"
-                              },
-                              {
-                                 "url": "https://openlibra.com/es/book/download/diseno-conceptual-de-bases-de-datos",
-                                 "title": "Diseño Conceptual de Bases de Datos"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Ciencia Computacional",
-                           "entries": [
-                              {
-                                 "url": "http://lya.fciencias.unam.mx/jloa/publicaciones/automatasyLenguajes.pdf",
-                                 "title": "Breves Notas sobre Autómatas y Lenguajes"
-                              },
-                              {
-                                 "url": "http://lya.fciencias.unam.mx/jloa/publicaciones/teoria.pdf",
-                                 "title": "Breves Notas sobre Teoría de la Computación"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Metodologías de desarrollo de software",
-                           "entries": [
-                              {
-                                 "url": "http://www.navegapolis.com/files/cis.pdf",
-                                 "title": "Compendio de Ingeniería del Software"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20150824055042/http://www.wolnm.org/apa/articulos/Ingenieria_Software.pdf",
-                                 "title": "Ingeniería de Software: Una Guía para Crear Sistemas de Información"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20140209204645/http://www.cursosdeprogramacionadistancia.com/static/pdf/material-sin-personalizar-agile.pdf",
-                                 "title": "Scrum & Extreme Programming (para programadores)"
-                              },
-                              {
-                                 "url": "https://scrumlevel.com/files/scrumlevel.pdf",
-                                 "title": "Scrum Level"
-                              },
-                              {
-                                 "url": "https://scrummanager.net/files/scrum_master.pdf",
-                                 "title": "Scrum Master - Temario troncal 1"
-                              },
-                              {
-                                 "url": "http://www.proyectalis.com/wp-content/uploads/2008/02/scrum-y-xp-desde-las-trincheras.pdf",
-                                 "title": "Scrum y XP desde las trincheras"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Misceláneos",
-                           "entries": [
-                              {
-                                 "url": "http://97cosas.com/programador/",
-                                 "title": "97 cosas que todo programador debería saber"
-                              },
-                              {
-                                 "url": "https://github.com/brunocascio/docker-espanol#docker",
-                                 "title": "Docker"
-                              },
-                              {
-                                 "url": "http://emanchado.github.io/camino-mejor-programador/downloads/camino_2013-01-19_0688b6e.html",
-                                 "title": "El camino a un mejor programador"
-                              },
-                              {
-                                 "url": "https://www.rediris.es/tecniris/archie/doc//TECNIRIS47-1b.pdf",
-                                 "title": "Introducción a Docker"
-                              },
-                              {
-                                 "url": "http://libros.metabiblioteca.org/bitstream/001/271/8/Programacion_Videojuegos_SDL.pdf",
-                                 "title": "Programación de videojuegos SDL"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Sistemas Operativos",
-                           "entries": [
-                              {
-                                 "url": "http://sistop.org/pdf/sistemas_operativos.pdf",
-                                 "title": "Fundamentos de Sistemas Operativos"
-                              },
-                              {
-                                 "url": "http://exa.unne.edu.ar/depar/areas/informatica/SistemasOperativos/sistope2.PDF",
-                                 "title": "Sistemas Operativos"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "http://www.hermosaprogramacion.com/android",
-                           "title": "Curso Android"
-                        },
-                        {
-                           "url": "http://ns2.elhacker.net/timofonica/manuales/Manual_Programacion_Android_v2.0.pdf",
-                           "title": "Manual de Programación Android v.2.0"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://www.alcancelibre.org/filemgmt_data/files/programaciongnulinux.pdf",
-                           "title": "GNU/Linux: Programación de Sistemas"
-                        },
-                        {
-                           "url": "http://repositori.uji.es/xmlui/bitstream/handle/10234/24306/s29.pdf",
-                           "title": "Introducción a la programación con C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "<a name=\"cpp\">",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20100701020037/http://www.tecnun.es/asignaturas/Informat1/AyudaInf/aprendainf/cpp/avanzado/cppavan.pdf",
-                           "title": "Aprenda C++ avanzado como si estuviera en primero"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20100701020025/http://www.tecnun.es/asignaturas/Informat1/AyudaInf/aprendainf/cpp/basico/cppbasico.pdf",
-                           "title": "Aprenda C++ básico como si estuviera en primero"
-                        },
-                        {
-                           "url": "http://antares.sip.ucm.es/cpareja/libroCPP/",
-                           "title": "Ejercicios de programación creativos y recreativos en C++"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Coffeescript",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/coffeescript",
-                           "title": "Coffeescript, un pequeño gran libro"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ensamblador",
-                     "entries": [
-                        {
-                           "url": "https://pacman128.github.io/static/pcasm-book-spanish.pdf",
-                           "title": "Lenguaje Ensamblador para PC"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Erlang",
-                     "entries": [
-                        {
-                           "url": "https://es.wikibooks.org/wiki/Programaci%C3%B3n_en_Erlang",
-                           "title": "Programación en Erlang"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Emacs",
-                     "entries": [
-                        {
-                           "url": "http://savannah.nongnu.org/git/?group=elisp-es",
-                           "title": "Una Introducción a Emacs Lisp en Español"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "https://esparta.github.io/gitimmersion-spanish",
-                           "title": "Git Immersión en Español"
-                        },
-                        {
-                           "url": "http://rogerdudler.github.io/git-guide",
-                           "title": "Git. La guía simple"
-                        },
-                        {
-                           "url": "http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/es",
-                           "title": "Gitmagic"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/es/",
-                           "title": "Pro Git"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/es/v2",
-                           "title": "Pro Git v2"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "https://raulexposito.com/the-little-go-book-en-castellano.html",
-                           "title": "El pequeño libro Go"
-                        },
-                        {
-                           "url": "https://nachopacheco.gitbooks.io/go-es/content/doc",
-                           "title": "Go en Español"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "http://aprendehaskell.es/main.html",
-                           "title": "¡Aprende Haskell por el bien de todos!"
-                        },
-                        {
-                           "url": "http://www.cs.us.es/~jalonso/publicaciones/Piensa_en_Haskell.pdf",
-                           "title": "Piensa en Haskell (ejercicios de programación funcional)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML & CSS",
-                     "entries": [
-                        {
-                           "url": "http://librosweb.es/libro/css_avanzado",
-                           "title": "CSS avanzado"
-                        },
-                        {
-                           "url": "https://openlibra.com/es/book/download/css3-y-javascript-avanzado",
-                           "title": "CSS3 y JavaScript avanzado"
-                        },
-                        {
-                           "url": "http://interfacesweb.github.io/unidades/",
-                           "title": "Diseño de Interfaces Web"
-                        },
-                        {
-                           "url": "https://freeditorial.com/es/books/el-gran-libro-del-diseno-web",
-                           "title": "El gran libro del diseño web"
-                        },
-                        {
-                           "url": "http://es.learnlayout.com",
-                           "title": "Estructura con CSS"
-                        },
-                        {
-                           "url": "https://openlibra.com/es/book/download/guia-completa-de-css3",
-                           "title": "Guía Completa de CSS3"
-                        },
-                        {
-                           "url": "https://openlibra.com/es/book/html5",
-                           "title": "HTML5"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/css/",
-                           "title": "Introducción a CSS"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://openlibra.com/es/book/download/aprendiendo-java-y-poo",
-                           "title": "Aprendiendo Java y POO (2008)"
-                        },
-                        {
-                           "url": "https://ia601504.us.archive.org/21/items/DesarrollandoConJava8Poker/DesarrollandoConJava8Poker.pdf",
-                           "title": "Desarrollando con Java 8: Poker"
-                        },
-                        {
-                           "url": "http://www3.uji.es/~belfern/libroJava.pdf",
-                           "title": "Desarrollo de proyectos informáticos con Java"
-                        },
-                        {
-                           "url": "https://www.arkaitzgarro.com/java/",
-                           "title": "Ejercicios de Programación en Java"
-                        },
-                        {
-                           "url": "http://lya.fciencias.unam.mx/jloa/publicaciones/introduccionJava.pdf",
-                           "title": "Notas de Introducción al Lenguaje de Programación Java (2004)"
-                        },
-                        {
-                           "url": "http://www.ungs.edu.ar/cm/uploaded_files/publicaciones/476_cid03-Pensar%20la%20computacion.pdf",
-                           "title": "Pensando la computación como un científico (con Java)"
-                        },
-                        {
-                           "url": "https://picodotdev.github.io/blog-bitix/assets/custom/PlugInTapestry.pdf",
-                           "title": "PlugIn Apache Tapestry: desarrollo de aplicaciones y páginas web"
-                        },
-                        {
-                           "url": "https://openlibra.com/es/book/download/practicas-de-java",
-                           "title": "Prácticas de Java (2009)"
-                        },
-                        {
-                           "url": "https://github.com/PabloReyes/ocpjp-resumen-espanol#ocpjp6-resumen-español",
-                           "title": "Preparando JavaSun 6 - OCPJP6"
-                        },
-                        {
-                           "url": "http://elvex.ugr.es/decsai/java/",
-                           "title": "Programación en Java"
-                        },
-                        {
-                           "url": "http://static1.1.sqspcdn.com/static/f/923743/14770633/1416082087870/JavaEE.pdf",
-                           "title": "Tutorial básico de Java EE"
-                        },
-                        {
-                           "url": "http://static1.1.sqspcdn.com/static/f/923743/15025126/1320942755733/Tutorial_de_Maven_3_Erick_Camacho.pdf",
-                           "title": "Tutorial introducción a Maven 3"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://es.javascript.info",
-                           "title": "El Tutorial de JavaScript Moderno"
-                        },
-                        {
-                           "url": "https://developer.mozilla.org/es/docs/Web/JavaScript/Guide",
-                           "title": "Guía de JavaScript 'Mozilla'"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/ajax",
-                           "title": "Introducción a AJAX"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/javascript",
-                           "title": "Introducción a JavaScript"
-                        },
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/es",
-                           "title": "Jardín de JavaScript"
-                        },
-                        {
-                           "url": "https://leanpub.com/javascript-inspirate",
-                           "title": "JavaScript, ¡Inspírate!"
-                        },
-                        {
-                           "url": "https://jsparagatos.com",
-                           "title": "JavaScript Para Gatos"
-                        },
-                        {
-                           "url": "https://desarrolloweb.com/manuales/manual-javascript.html#capitulos20",
-                           "title": "Manual de JavaScript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "http://raulexposito.com/documentos/como-aprender-angularjs/",
-                                 "title": "¿Cómo aprender AngularJS?"
-                              },
-                              {
-                                 "url": "https://eladrodriguez.gitbooks.io/angularjs",
-                                 "title": "AngularJS"
-                              },
-                              {
-                                 "url": "https://github.com/johnpapa/angular-styleguide/blob/master/a1/i18n/es-ES.md",
-                                 "title": "Guía de estilo AngularJS"
-                              },
-                              {
-                                 "url": "https://desarrolloweb.com/manuales/manual-angularjs.html",
-                                 "title": "Manual de AngularJS"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "D3.js",
-                           "entries": [
-                              {
-                                 "url": "http://gcoch.github.io/D3-tutorial/index.html",
-                                 "title": "Tutorial de D3"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "jQuery",
-                           "entries": [
-                              {
-                                 "url": "https://librosweb.es/libro/fundamentos_jquery",
-                                 "title": "Fundamentos de jQuery"
-                              },
-                              {
-                                 "url": "http://mundosica.github.io/tutorial_hispano_jQuery/",
-                                 "title": "Manual de jQuery"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "http://nodejskoans.com",
-                                 "title": "Introducción a Node.js a través de Koans"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React",
-                           "entries": [
-                              {
-                                 "url": "https://leanpub.com/react-redux",
-                                 "title": "Desarrollo de Aplicaciones Web con React.js y Redux.js"
-                              },
-                              {
-                                 "url": "https://leanpub.com/descubre-react",
-                                 "title": "Descubre React"
-                              },
-                              {
-                                 "url": "https://leanpub.com/the-road-to-learn-react-spanish",
-                                 "title": "El Camino para Aprender React"
-                              },
-                              {
-                                 "url": "https://es.survivejs.com",
-                                 "title": "SurviveJS - React de aprendiz a maestro"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://osl.ugr.es/CTAN/info/lshort/spanish/lshort-a4.pdf",
-                           "title": "La introducción no-tan-corta a LaTeX 2ε"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "http://xinfo.sourceforge.net/documentos/bash-scripting/bash-script-2.0.html",
-                           "title": "Bases de la Programación en Bash"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20150307181233/http://library.originalhacker.org:80/biblioteca/articulo/ver/123",
-                           "title": "BASH Scripting Avanzado: Utilizando Declare para definición de tipo"
-                        },
-                        {
-                           "url": "https://es.wikibooks.org/wiki/El_Manual_de_BASH_Scripting_B%C3%A1sico_para_Principiantes",
-                           "title": "El Manual de BASH Scripting Básico para Principiantes"
-                        },
-                        {
-                           "url": "https://debian-handbook.info/browse/es-ES/stable/",
-                           "title": "El Manual del Administrador de Debian"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Matemáticas",
-                     "entries": [
-                        {
-                           "url": "http://www.sage-para-estudiantes.com",
-                           "title": "Sage para Estudiantes de Pregrado"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": ".NET (C# / Visual Studio)",
-                     "entries": [
-                        {
-                           "url": "http://dis.um.es/~bmoros/privado/bibliografia/LibroCsharp.pdf",
-                           "title": "El lenguaje de programación C#"
-                        },
-                        {
-                           "url": "https://blogs.msdn.microsoft.com/cesardelatorre/2010/03/11/nuestro-nuevo-libro-guia-de-arquitectura-n-capas-ddd-net-4-0-y-aplicacion-ejemplo-en-disponibles-para-download-en-msdn-y-codeplex",
-                           "title": "Guía de Arquitectura N-capas Orientadas al Dominio"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "NoSQL",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "MongoDB",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/uokesita/the-little-mongodb-book",
-                                 "title": "El pequeño libro MongoDB"
-                              },
-                              {
-                                 "url": "https://dpdc.gitbooks.io/mongodb-en-espanol-tomo-1/content",
-                                 "title": "MongoDB en español: T1, El principio"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Redis",
-                           "entries": [
-                              {
-                                 "url": "https://raulexposito.com/the-little-redis-book-en-castellano.html",
-                                 "title": "El pequeño libro Redis"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://www.youtube.com/playlist?list=PLfgj7DYkKH3DjmXTOxIMs-5fcOgDg_Dd2",
-                           "title": "Domain Driven Design with PHP (Diseño guiado por Dominio con PHP)"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20140209203630/http://www.cursosdeprogramacionadistancia.com/static/pdf/material-sin-personalizar-php.pdf",
-                           "title": "Manual de estudio introductorio al lenguaje PHP procedural"
-                        },
-                        {
-                           "url": "https://styde.net/php-y-programacion-orientada-a-objetos/",
-                           "title": "PHP y Programación orientada a objetos"
-                        },
-                        {
-                           "url": "http://www.bubok.es/libros/205199/POO-y-MVC-en-PHP",
-                           "title": "POO y MVC en PHP"
-                        },
-                        {
-                           "url": "http://rua.ua.es/dspace/bitstream/10045/13176/9/04-ajaxphp.pdf",
-                           "title": "Programación web avanzada: Ajax y Google Maps"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/silex",
-                           "title": "Silex, el manual oficial"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/symfony_1_4",
-                           "title": "Symfony 1.4, la guía definitiva"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/symfony_2_4/",
-                           "title": "Symfony 2.4, el libro oficial"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/es/index.html",
-                                 "title": "Symfony 5: La Vía Rápida"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "http://es.tldp.org/Tutoriales/PERL/tutoperl-print.pdf",
-                           "title": "Tutorial Perl"
-                        },
-                        {
-                           "url": "http://kataix.umag.cl/~ruribe/Utilidades/Tutorial%20de%20Perl.pdf",
-                           "title": "Tutorial Perl"
-                        },
-                        {
-                           "url": "http://perlenespanol.com/tutoriales/",
-                           "title": "Tutoriales de Perl"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl 6 / Raku",
-                     "entries": [
-                        {
-                           "url": "https://uzluisf.gitlab.io/piensaperl6/",
-                           "title": "Piensa en Perl 6"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://argentinaenpython.com/quiero-aprender-python/aprenda-a-pensar-como-un-programador-con-python.pdf",
-                           "title": "Aprenda a pensar como un programador (con Python)"
-                        },
-                        {
-                           "url": "http://code.google.com/p/swfk-es/",
-                           "title": "Doma de Serpientes para Niños: Aprendiendo a Programar con Python"
-                        },
-                        {
-                           "url": "https://code.google.com/archive/p/inmersionenpython3/",
-                           "title": "Inmersión en Python"
-                        },
-                        {
-                           "url": "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/inmersionenpython3/inmersionEnPython3.0.11.pdf",
-                           "title": "Inmersión en Python 3"
-                        },
-                        {
-                           "url": "http://repositori.uji.es/xmlui/bitstream/handle/10234/24305/s23.pdf",
-                           "title": "Introducción a la programación con Python"
-                        },
-                        {
-                           "url": "http://opentechschool.github.io/python-beginners/es_CL/",
-                           "title": "Introducción a Programando con Python"
-                        },
-                        {
-                           "url": "https://github.com/mgaitan/curso-python-cientifico#curso-de-python-para-ciencias-e-ingenierías",
-                           "title": "Python para ciencia e ingeniería"
-                        },
-                        {
-                           "url": "http://librosweb.es/libro/python",
-                           "title": "Python para principiantes"
-                        },
-                        {
-                           "url": "https://launchpadlibrarian.net/18980633/Python%20para%20todos.pdf",
-                           "title": "Python para todos"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/es/",
-                                 "title": "Tutorial de Django Girls"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Web2py",
-                           "entries": [
-                              {
-                                 "url": "http://www.web2py.com/books/default/chapter/41",
-                                 "title": "Web2py - Manual de Referencia Completo, 5a Edición"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "http://rubysur.org/aprende.a.programar",
-                           "title": "Aprende a programar con Ruby"
-                        },
-                        {
-                           "url": "https://github.com/alemohamad/ruby-style-guide/blob/master/README-esLA.md#preludio",
-                           "title": "La Guía de Estilos de Ruby"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/es/documentation/quickstart",
-                           "title": "Ruby en 20 minutos"
-                        },
-                        {
-                           "url": "http://rubytutorial.wikidot.com/introduccion",
-                           "title": "Ruby tutorial o cómo pasar un buen rato programando"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Ruby on Rails",
-                           "entries": [
-                              {
-                                 "url": "http://rubysur.org/introduccion.a.rails/",
-                                 "title": "Introducción a Rails"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Risk-Cartas-sobre-Estadistica.pdf",
-                           "title": "Cartas sobre Estadística de la Revista Argentina de Bioingeniería"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Rivera-Tutorial_Sweave.pdf",
-                           "title": "Generación automática de reportes con R y LaTeX"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/grafi3.pdf",
-                           "title": "Gráficos Estadísticos con R"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/R-intro-1.1.0-espanol.1.pdf",
-                           "title": "Introducción a R"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/curso-R.Diaz-Uriarte.pdf",
-                           "title": "Introducción al uso y programación del sistema estadístico R"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Saez-Castillo-RRCmdrv21.pdf",
-                           "title": "Métodos Estadísticos con R y R Commander"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Optimizacion_Matematica_con_R_Volumen_I.pdf",
-                           "title": "Optimización Matemática con R: Volúmen I"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/rdebuts_es.pdf",
-                           "title": "R para Principiantes"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scala",
-                     "entries": [
-                        {
-                           "url": "http://www.scala-lang.org/docu/files/ScalaTutorial-es_ES.pdf",
-                           "title": "Manual de Scala para programadores Java"
-                        },
-                        {
-                           "url": "https://github.com/ErunamoJAZZ/ScalaByExample-es",
-                           "title": "Scala con Ejemplos"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "https://github.com/programamos/GuiaScratch",
-                           "title": "Informática Creativa"
-                        },
-                        {
-                           "url": "https://lsi.vc.ehu.es/pablogn/docencia/FdI/Scratch/Aprenda%20a%20programar%20con%20Scratch%20en%20un%20par%20de%20tardes.pdf",
-                           "title": "Manual de Scratch 2"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL",
-                     "entries": [
-                        {
-                           "url": "http://jorgesanchez.net/manuales/sql/intro-sql-sql2016.html",
-                           "title": "Manual de SQL"
-                        },
-                        {
-                           "url": "http://www.desarrolloweb.com/manuales/9/",
-                           "title": "Tutorial de SQL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Subversion",
-                     "entries": [
-                        {
-                           "url": "http://svnbook.red-bean.com/nightly/es/index.html",
-                           "title": "Control de versiones con Subversion"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SVG",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/scalable/",
-                           "title": "Scalable. Un libro sobre SVG"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://riptutorial.com/Download/typescript-es.pdf",
-                           "title": "Aprendizaje TypeScript"
-                        },
-                        {
-                           "url": "https://khru.gitbooks.io/typescript/",
-                           "title": "Introduccion a TypeScript"
-                        },
-                        {
-                           "url": "https://github.com/melissarofman/typescript-book",
-                           "title": "TypeScript Deep Dive"
-                        },
-                        {
-                           "url": "https://neliosoftware.com/es/blog/uso-avanzado-de-typescript/",
-                           "title": "Uso avanzado de TypeScript en un ejemplo real"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://rldona.gitbooks.io/angular-2-book",
-                                 "title": "Angular 2"
-                              },
-                              {
-                                 "url": "https://ngchallenges.gitbook.io",
-                                 "title": "Aprendiendo Angular"
-                              },
-                              {
-                                 "url": "https://riptutorial.com/Download/angular-es.pdf",
-                                 "title": "Aprendizaje Angular"
-                              },
-                              {
-                                 "url": "https://riptutorial.com/Download/angular-2-es.pdf",
-                                 "title": "Aprendizaje Angular 2"
-                              },
-                              {
-                                 "url": "https://jorgeucano.gitbook.io/entendiendo-angular/",
-                                 "title": "Entendiendo Angular"
-                              }
-                           ]
-                        }
-                     ]
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "et",
-                  "name": "Estonian"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://et.wikibooks.org/wiki/Programmeerimiskeel_C",
-                           "title": "Programmeerimiskeel C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "https://digiarhiiv.ut.ee/Ained/Doc/VFailid/CSharp_ja_VS.pdf",
-                           "title": "Microsoft Visual Studio Code ja C#"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://ained.ttu.ee/javadoc/index.html",
-                           "title": "Java õppematerjalid"
-                        },
-                        {
-                           "url": "https://et.wikibooks.org/wiki/Programmeerimiskeel_Java",
-                           "title": "Programmeerimiskeel Java"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://puhang.tpt.edu.ee/raamatud/JavaScript_konspekt.pdf",
-                           "title": "JavaScript"
-                        },
-                        {
-                           "url": "http://lepo.it.da.ut.ee/~epuman/javascript.html",
-                           "title": "Javascript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "http://www.cs.tlu.ee/teemad/get_file.php?id=400",
-                                 "title": "AngularJS raamistiku õppematerjal"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Vue",
-                           "entries": [
-                              {
-                                 "url": "http://www.cs.tlu.ee/teemaderegister/get_file.php?id=715",
-                                 "title": "Vue"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://et.wikibooks.org/wiki/PHP",
-                           "title": "PHP põhitõed ning funktsioonid"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://progeopik.cs.ut.ee",
-                           "title": "Programmeerimise õpik"
-                        },
-                        {
-                           "url": "https://courses.cs.ut.ee/MTAT.03.100/2012_fall/uploads/opik/00_eessona.html",
-                           "title": "Pythoni algteadmised"
-                        },
-                        {
-                           "url": "https://et.wikibooks.org/wiki/Python",
-                           "title": "Pythoni wikiraamat"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "https://andmeteadus.github.io/2015/rakendustarkvara_R/",
-                           "title": "Statistiline andmeteadus ja visualiseerimine R keele abil"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL",
-                     "entries": [
-                        {
-                           "url": "https://comserv.cs.ut.ee/home/files/Ivanova_Informaatika_2017.pdf?study=ATILoputoo&reference=C408CC06DE4620A985CDF60C2678C97AE45017AB",
-                           "title": "SQL päringute koostamine, analüüsimine  ja optimeerimine"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "WebGL",
-                     "entries": [
-                        {
-                           "url": "http://www.cs.tlu.ee/teemaderegister/get_file.php?id=351",
-                           "title": "WebGL'i kasutamine interaktiivsete graafikarakenduste loomiseks veebilehitsejas"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "fa-IR",
-                  "name": "Persian (Iran)"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "رایانش ابری",
-                     "entries": [
-                        {
-                           "url": "http://docs.occc.ir/books/Main%20Book-20110110_2.pdf",
-                           "title": "رایانش ابری"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "شبکه",
-                     "entries": [],
-                     "subsections": []
-                  },
-                  {
-                     "section": "مهندسی نرم‌افزار",
-                     "entries": [
-                        {
-                           "url": "https://github.com/khajavi/Practical-Design-Patterns",
-                           "title": "الگوهای طراحی در برنامه‌نویسی شیء‌گرا"
-                        },
-                        {
-                           "url": "https://github.com/Noah1001000/clean-code-persian",
-                           "title": "ترجمه آزاد کتاب کد تمیز"
-                        },
-                        {
-                           "url": "http://fa.learnlayout.com",
-                           "title": "یادگیری پیکربندی با CSS"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://javacup.ir/javacup-training-videos/",
-                           "title": "آموزش  برنامه‌نویسی جاوا"
-                        },
-                        {
-                           "url": "https://toplearn.com/courses/85/%D8%A2%D9%85%D9%88%D8%B2%D8%B4-%D8%AC%D8%A7%D9%88%D8%A7-%D8%A7%D8%B2-%D8%B5%D9%81%D8%B1",
-                           "title": "آموزش جاوا از صفر"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://www.ctan.org/tex-archive/info/lshort/persian",
-                           "title": "مقدمه ای نه چندان کوتاه بر LaTeX"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/current/the-fast-track/fa/index.html",
-                                 "title": "سیمفونی ۵: سریع‌ترین مسیر"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://python.coderz.ir",
-                           "title": "کتاب آزاد آموزش پایتون"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Raeesi-SNA_in_R_in_Farsi.pdf",
-                           "title": "تحلیل شبکه‌های اجتماعی در R"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Mousavi-R-lang_in_Farsi.pdf",
-                           "title": "راهنمای زبان R"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Mousavi-R_topics_in_Farsi.pdf",
-                           "title": "موضعات ویژه در R"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "fi",
-                  "name": "Finnish"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "Kieliagnostinen",
-                     "entries": [
-                        {
-                           "url": "https://www.cs.helsinki.fi/u/ahslaaks/kkkk.pdf",
-                           "title": "Kisakoodarin käsikirja"
-                        },
-                        {
-                           "url": "https://grader.cs.hut.fi/static/y1/",
-                           "title": "Ohjelmoinnin peruskurssi Y1 - Opetusmoniste syksy 2017"
-                        },
-                        {
-                           "url": "https://jyx.jyu.fi/bitstream/handle/123456789/47415/978-951-39-4624-1.pdf",
-                           "title": "Ohjelmointi 2"
-                        },
-                        {
-                           "url": "http://urn.fi/URN:ISBN:978-952-265-756-5",
-                           "title": "Olio-ohjelmointi käytännössä käyttäen hyväksi avointa tietoa, graafista käyttöliittymää ja karttaviitekehystä"
-                        },
-                        {
-                           "url": "https://jyx.jyu.fi/bitstream/handle/123456789/49293/oasmoniste.pdf",
-                           "title": "Oliosuuntautunut analyysi ja suunnittelu"
-                        },
-                        {
-                           "url": "https://www.cs.helsinki.fi/u/ahslaaks/tirakirja/",
-                           "title": "Tietorakenteet ja algoritmit"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/C",
-                           "title": "C"
-                        },
-                        {
-                           "url": "http://www.ohjelmointiputka.net/oppaat/opas.php?tunnus=c_esittaja",
-                           "title": "C-ohjelmointi"
-                        },
-                        {
-                           "url": "http://cs.stadia.fi/~silas/ohjelmointi/c_opas",
-                           "title": "Ohjelmoinnin perusteet ja C-kieli"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "https://jyx.jyu.fi/bitstream/handle/123456789/47417/978-951-39-4859-7.pdf",
-                           "title": "Ohjelmointi 1: C#"
-                        },
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/C%2B%2B",
-                           "title": "C++"
-                        },
-                        {
-                           "url": "https://www.ohjelmointiputka.net/oppaat/opas.php?tunnus=cpp_ohj_01",
-                           "title": "C++-ohjelmointi"
-                        },
-                        {
-                           "url": "http://www.nic.funet.fi/c++opas/",
-                           "title": "C++-opas"
-                        },
-                        {
-                           "url": "http://www.cs.tut.fi/~oliot/kirja/olioiden-ohjelmointi-uusin.pdf",
-                           "title": "Olioiden ohjelmointi C++:lla"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://urn.fi/URN:ISBN:978-952-265-754-1",
-                           "title": "Olio-ohjelmointi Javalla"
-                        },
-                        {
-                           "url": "http://staff.cs.utu.fi/staff/jouni.smed/SHR07-SPOO.pdf",
-                           "title": "Sopimuspohjainen olio-ohjelmointi Java-kielellä"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/JavaScript",
-                           "title": "JavaScript"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "https://www.ohjelmointiputka.net/oppaat/opas.php?tunnus=mysqlphp01",
-                           "title": "MySQL ja PHP"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "OpenGL",
-                     "entries": [
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/OpenGL",
-                           "title": "OpenGL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/PHP",
-                           "title": "PHP"
-                        },
-                        {
-                           "url": "http://www.ohjelmointiputka.net/oppaat/opas.php?tunnus=php_01",
-                           "title": "PHP-ohjelmointi"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/Python_2",
-                           "title": "Python 2"
-                        },
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/Python_3",
-                           "title": "Python 3"
-                        },
-                        {
-                           "url": "http://urn.fi/URN:ISBN:978-952-214-970-1",
-                           "title": "Python 3 – ohjelmointiopas"
-                        },
-                        {
-                           "url": "http://www.ohjelmointiputka.net/oppaat/opas.php?tunnus=python3_01",
-                           "title": "Python-ohjelmointi"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "https://users.syk.fi/~jhurri/otm/",
-                           "title": "Ohjelmointi ja tilastolliset menetelmät"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20160814115908/http://cc.oulu.fi/~tilel/rltk04/Rekola.pdf",
-                           "title": "R: Opas ekologeille"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://fi.wikibooks.org/wiki/Ruby",
-                           "title": "Ruby"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "fr",
-                  "name": "French"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "0 - Méta-listes",
-                     "entries": [
-                        {
-                           "url": "https://wiki.inria.fr/sciencinfolycee/Accueil",
-                           "title": "Le SILO: Sciences du numérique & Informatique au Lycée: Oui!"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "1 - Non dépendant du langage",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Algorithmique",
-                           "entries": [
-                              {
-                                 "url": "http://pauillac.inria.fr/~quercia/cdrom/cours/",
-                                 "title": "Algorithmique"
-                              },
-                              {
-                                 "url": "http://www.liafa.univ-paris-diderot.fr/~sperifel/livre_complexite.html",
-                                 "title": "Complexité algorithmique"
-                              },
-                              {
-                                 "url": "http://www-igm.univ-mlv.fr/~berstel/Elements/Elements.pdf",
-                                 "title": "Éléments d'algorithmique"
-                              },
-                              {
-                                 "url": "http://www.france-ioi.org",
-                                 "title": "France-IOI"
-                              },
-                              {
-                                 "url": "https://prologin.org",
-                                 "title": "Prologin"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Logiciels libres",
-                           "entries": [
-                              {
-                                 "url": "http://framabook.org/histoiresetculturesdulibre/",
-                                 "title": "Histoires et cultures du Libre"
-                              },
-                              {
-                                 "url": "http://framabook.org/optionlibre-dubonusagedeslicenceslibres/",
-                                 "title": "Option libre. Du bon usage des licences libres"
-                              },
-                              {
-                                 "url": "http://framabook.org/produire-du-logiciel-libre-2/",
-                                 "title": "Produire du logiciel libre"
-                              },
-                              {
-                                 "url": "http://framabook.org/richard-stallman-et-la-revolution-du-logiciel-libre-2/",
-                                 "title": "Richard Stallman et la révolution du logiciel libre"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Makefile",
-                           "entries": [
-                              {
-                                 "url": "http://icps.u-strasbg.fr/people/loechner/public_html/enseignement/GL/make.pdf",
-                                 "title": "Concevoir un Makefile"
-                              },
-                              {
-                                 "url": "http://eric.bachard.free.fr/UTBM_LO22/P07/C/Documentation/C/make/intro_makefile.pdf",
-                                 "title": "Introduction aux Makefile"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Pédagogie pour enfants et adolescents",
-                           "entries": [
-                              {
-                                 "url": "https://pixees.fr/?cat=612",
-                                 "title": "Activités débranchées"
-                              },
-                              {
-                                 "url": "https://interstices.info/enseigner-et-apprendre-les-sciences-informatiques-a-lecole/",
-                                 "title": "Apprendre l'informatique sans ordinateur"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Ada",
-                     "entries": [
-                        {
-                           "url": "http://d.feneuille.free.fr/cours-ada-iut.zip",
-                           "title": "Cours Ada"
-                        },
-                        {
-                           "url": "http://d.feneuille.free.fr/c++%20to%20ada%201.0a.pdf",
-                           "title": "Cours Ada 95 pour le programmeur C++"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Assembleur",
-                     "entries": [
-                        {
-                           "url": "http://drpaulcarter.com/pcasm/",
-                           "title": "PC Assembly Language"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Bash / Shell",
-                     "entries": [
-                        {
-                           "url": "http://abs.traduc.org/abs-fr/",
-                           "title": "Guide avancé d'écriture des scripts Bash"
-                        },
-                        {
-                           "url": "https://frederic-lang.developpez.com/tutoriels/linux/prog-shell/",
-                           "title": "La programmation Shell"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Caml",
-                     "entries": [
-                        {
-                           "url": "http://caml.inria.fr",
-                           "title": "Le language Caml"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C / C++",
-                     "entries": [
-                        {
-                           "url": "http://casteyde.christian.free.fr/cpp/cours/online/book1.html",
-                           "title": "Cours de C/C++"
-                        },
-                        {
-                           "url": "http://vidalc.chez.com/lf/socket.html",
-                           "title": "Guide pour la programmation réseaux de Beej's - Utilisation des sockets Internet"
-                        },
-                        {
-                           "url": "http://framabook.org/le-c-en-20-heures-2/",
-                           "title": "Le C en 20 heures"
-                        },
-                        {
-                           "url": "https://zestedesavoir.com/tutoriels/755/le-langage-c-1/",
-                           "title": "Le langage C"
-                        },
-                        {
-                           "url": "https://sites.uclouvain.be/SystInfo/notes/Theorie/",
-                           "title": "Programmation en Langage C et Systèmes Informatiques"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Coq",
-                     "entries": [
-                        {
-                           "url": "http://www.labri.fr/perso/casteran/CoqArt/",
-                           "title": "Le Coq'Art (V8)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CSS",
-                     "entries": [
-                        {
-                           "url": "http://fr.learnlayout.com",
-                           "title": "Apprendre les mises en page CSS"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Fortran",
-                     "entries": [
-                        {
-                           "url": "http://www.idris.fr/formations/fortran/fortran-77.html",
-                           "title": "IDRIS adaptation of the Fortran 77 manual"
-                        },
-                        {
-                           "url": "http://www.idris.fr/formations/fortran/",
-                           "title": "IDRIS Formations Fortran: documentation"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/fr/",
-                           "title": "Git Magic"
-                        },
-                        {
-                           "url": "http://www.git-scm.com/book/fr/v2",
-                           "title": "Pro Git"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://www.jmdoudoux.fr/accueil_java.htm#dej",
-                           "title": "Développons en Java"
-                        },
-                        {
-                           "url": "http://myflex.org/books/java4kids/java4kids.htm",
-                           "title": "Java Programming for Kids, Parents and Grandparents"
-                        },
-                        {
-                           "url": "http://3monkeys.github.io/play.rules/",
-                           "title": "Play.Rules!"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://fr.eloquentjavascript.net",
-                           "title": "JavaScript Éloquent : Une introduction moderne à la programmation"
-                        },
-                        {
-                           "url": "https://oncletom.io/node.js/#chapitres",
-                           "title": "Node.Js: Apprendre par la pratique"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "jQuery",
-                     "entries": [
-                        {
-                           "url": "https://sutterlity.gitbooks.io/apprendre-jquery/content/",
-                           "title": "Apprendre jQuery"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "http://gorgonite.developpez.com/livres/traductions/haskell/gentle-haskell/",
-                           "title": "A Gentle Introduction to Haskell"
-                        },
-                        {
-                           "url": "http://lyah.haskell.fr",
-                           "title": "Apprendre Haskell vous fera le plus grand bien !"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "(La)TeX et associés",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "LaTeX",
-                           "entries": [
-                              {
-                                 "url": "https://tex.loria.fr/general/apprends-latex.pdf",
-                                 "title": "Apprends LaTeX"
-                              },
-                              {
-                                 "url": "http://math.univ-lyon1.fr/irem/IMG/pdf/LatexPourLeProfDeMaths.pdf",
-                                 "title": "LaTeX... pour le prof de maths !"
-                              },
-                              {
-                                 "url": "http://framabook.org/tout-sur-latex/",
-                                 "title": "Tout ce que vous avez toujours voulu savoir sur LaTeX sans jamais oser le demander"
-                              },
-                              {
-                                 "url": "http://geekographie.maieul.net/95",
-                                 "title": "(Xe)LaTeX appliqué aux sciences humaines"
-                              },
-                              {
-                                 "url": "https://framabook.org/koma-script/",
-                                 "title": "KOMA-Script, Typographie universelle avec XƎLaTeX"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Asymptote",
-                           "entries": [
-                              {
-                                 "url": "http://cgmaths.fr/cgFiles/Dem_Rapide.pdf",
-                                 "title": "Asymptote. Démarrage rapide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Metapost",
-                           "entries": [
-                              {
-                                 "url": "http://melusine.eu.org/syracuse/metapost/f-mpgraph.pdf",
-                                 "title": "Tracer des graphes avec Metapost"
-                              },
-                              {
-                                 "url": "http://melusine.eu.org/syracuse/metapost/f-mpman-2.pdf",
-                                 "title": "Un manuel de Metapost"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "PGF/TikZ",
-                           "entries": [
-                              {
-                                 "url": "http://math.et.info.free.fr/TikZ/",
-                                 "title": "TikZ pour l'impatient"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "TeX",
-                           "entries": [
-                              {
-                                 "url": "https://ctan.org/pkg/apprendre-a-programmer-en-tex",
-                                 "title": "Apprendre à programmer en TeX"
-                              },
-                              {
-                                 "url": "http://www.apprendre-en-ligne.net/LaTeX/teximpatient.pdf",
-                                 "title": "TeX pour l'Impatient"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Lisp",
-                     "entries": [
-                        {
-                           "url": "http://www.algo.be/logo1/lisp/intro-lisp.pdf",
-                           "title": "Introduction à la programmation en Common Lisp"
-                        },
-                        {
-                           "url": "http://dept-info.labri.fr/~strandh/Teaching/Programmation-Symbolique/Common/Book/HTML/programmation.html",
-                           "title": "Traité de programmation en Common Lisp"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Mathématiques",
-                     "entries": [
-                        {
-                           "url": "http://sagebook.gforge.inria.fr",
-                           "title": "Calcul mathématique avec Sage"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lua",
-                     "entries": [
-                        {
-                           "url": "http://www.luteus.biz/Download/LoriotPro_Doc/LUA/LUA_Training_FR/Introduction_Programmation.html",
-                           "title": "Introduction à la programmation Lua"
-                        },
-                        {
-                           "url": "http://wxlua.developpez.com/tutoriels/lua/general/cours-complet/",
-                           "title": "Lua : le tutoriel"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Meteor",
-                     "entries": [
-                        {
-                           "url": "https://mquandalle.gitbooks.io/apprendre-meteor/content/",
-                           "title": "Apprendre Meteor"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "http://formation-perl.fr/guide-perl.html",
-                           "title": "Guide Perl - débuter et progresser en Perl"
-                        },
-                        {
-                           "url": "http://perl.mines-albi.fr/DocFr.html",
-                           "title": "La documentation Perl en français"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://g-rossolini.developpez.com/tutoriels/php/cours/?page=introduction",
-                           "title": "Cours de PHP 5"
-                        },
-                        {
-                           "url": "http://www.lincoste.com/ebooks/pdf/informatique/programmer_php.pdf",
-                           "title": "Programmer en PHP"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/fr/index.html",
-                                 "title": "En route pour Symfony 5"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Processing",
-                     "entries": [
-                        {
-                           "url": "https://fr.flossmanuals.net/processing/",
-                           "title": "Processing"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://inforef.be/swi/python.htm",
-                           "title": "Appendre à programmer avec Python"
-                        },
-                        {
-                           "url": "https://self-learning.info.ucl.ac.be/index/info1-exercises",
-                           "title": "Introduction à la programmation"
-                        },
-                        {
-                           "url": "https://python-guide-fr.readthedocs.io/fr/latest/",
-                           "title": "Le guide de l’auto-stoppeur pour Python!"
-                        },
-                        {
-                           "url": "http://www.lincoste.com/ebooks/pdf/informatique/python.pdf",
-                           "title": "Python"
-                        },
-                        {
-                           "url": "https://perso.limsi.fr/pointal/python:courspython3",
-                           "title": "Une introduction à Python 3"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/fr/",
-                                 "title": "Tutoriel de Django Girls"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "https://larmarange.github.io/analyse-R/",
-                           "title": "Introduction à l'analyse d'enquête avec R et RStudio"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Goulet_introduction_programmation_R.pdf",
-                           "title": "Introduction à la programmation en R"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://www.ruby-lang.org/fr/documentation/quickstart/",
-                           "title": "Ruby en vingt minutes"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/fr/documentation/ruby-from-other-languages/",
-                           "title": "Venir à Ruby après un autre language"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Ruby on Rails",
-                           "entries": [
-                              {
-                                 "url": "http://french.railstutorial.org/chapters/beginning",
-                                 "title": "Tutoriel Ruby on Rails : Apprendre Rails par l'exemple"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Rust",
-                     "entries": [
-                        {
-                           "url": "https://jimskapt.github.io/rust-book-fr/",
-                           "title": "Traduction du Rust book en français"
-                        },
-                        {
-                           "url": "https://blog.guillaume-gomez.fr/Rust/",
-                           "title": "Tutoriel rust"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Sage",
-                     "entries": [
-                        {
-                           "url": "https://hal.inria.fr/inria-00540485/file/sagebook-web-20130530.pdf",
-                           "title": "Calcul mathématique avec Sage"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scilab",
-                     "entries": [
-                        {
-                           "url": "http://forge.scilab.org/index.php/p/docintrotoscilab/downloads/",
-                           "title": "Introduction à Scilab"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "https://pixees.fr/programmation-creative-en-scratch/",
-                           "title": "Informatique Créative"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SPIP",
-                     "entries": [
-                        {
-                           "url": "http://programmer.spip.net",
-                           "title": "Programmer avec SPIP"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL",
-                     "entries": [
-                        {
-                           "url": "https://sgbd.developpez.com/tutoriels/cours-complet-bdd-sql/",
-                           "title": "Cours complet pour apprendre les différents types de bases de données et le langage SQL"
-                        },
-                        {
-                           "url": "https://framabook.org/not-only-sql/",
-                           "title": "Only SQL. Tout ce que vous avez toujours voulu savoir sur les SGBD sans jamais avoir osé le demander."
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Systèmes d'exploitation",
-                     "entries": [
-                        {
-                           "url": "http://sos.enix.org/fr/SOSDownload",
-                           "title": "Simple OS (SOS)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TEI",
-                     "entries": [
-                        {
-                           "url": "http://books.openedition.org/oep/1237",
-                           "title": "Qu'est-ce que la Text Encoding Initiative ?"
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-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Vim",
-                     "entries": [
-                        {
-                           "url": "http://yannesposito.com/Scratch/fr/blog/Learn-Vim-Progressively/",
-                           "title": "Learn Vim Progressively"
-                        },
-                        {
-                           "url": "https://vimebook.com/fr",
-                           "title": "Vim pour les humains"
-                        }
-                     ],
-                     "subsections": []
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-               "language": {
-                  "code": ""
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-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://repository.kallipos.gr/bitstream/11419/1346/1/00_master%20document_KOY.pdf",
-                           "title": "Διαδικαστικός προγραμματισμός"
-                        },
-                        {
-                           "url": "http://www.ebooks4greeks.gr/2011.Download_free-ebooks/Pliroforikis/glossa_programmatismoy_C++__eBooks4Greeks.gr.pdf",
-                           "title": "Εισαγωγή στη C++"
-                        },
-                        {
-                           "url": "https://repository.kallipos.gr/bitstream/11419/6443/1/00_master_document-KOY.pdf",
-                           "title": "Προγραμματισμός με τη γλώσσα C++"
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-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://repository.kallipos.gr/bitstream/11419/6217/4/DataStructures-%ce%9a%ce%9f%ce%a5.pdf",
-                           "title": "Δομές δεδομένων"
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-                           "url": "http://www.ebooks4greeks.gr/wp-content/uploads/2013/03/Java-free-book.pdf",
-                           "title": "Εισαγωγή στη Java"
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-                        {
-                           "url": "http://www.ebooks4greeks.gr/dowloads/Pliroforiki/Glosses.program./Java__Downloaded_from_eBooks4Greeks.gr.pdf",
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-                        {
-                           "url": "http://www.ebooks4greeks.gr/wp-content/uploads/2013/04/java-2012-eBooks4Greeks.gr_.pdf",
-                           "title": "Ηλεκτρονικό εγχειρίδιο της JAVA"
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-                        {
-                           "url": "http://www.ebooks4greeks.gr/wp-content/uploads/2013/03/shmeiwseis-Java-eBooks4Greeks.gr_.pdf",
-                           "title": "Σημειώσεις Java"
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-                     "section": "Javascript",
-                     "entries": [
-                        {
-                           "url": "https://www.ebooks4greeks.gr/html5-javascript",
-                           "title": "HTML5-JavaScript (Δημιουργώντας παιχνίδια – Ο εύκολος τρόπος)"
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-                        {
-                           "url": "https://www.ebooks4greeks.gr/eisagwgh-ston-programmatismo-me-arwgo-th-glwssa-python",
-                           "title": "Εισαγωγή στον Προγραμματισμό με Αρωγό τη Γλώσσα Python"
-                        },
-                        {
-                           "url": "https://archive.org/details/AByteOfPythonEl",
-                           "title": "Ένα byte της Python"
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-                     "subsections": []
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-                  {
-                     "section": "Scala",
-                     "entries": [
-                        {
-                           "url": "https://github.com/mrdimosthenis/creative-scala",
-                           "title": "Creative Scala"
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-                           "url": "https://www.ebooks4greeks.gr/eisagwgh-sthn-sql-ergasthriakes-askhseis-se-mysql5-7",
-                           "title": "Εισαγωγή στην SQL: Εργαστηριακές Ασκήσεις σε MySQL5.7"
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-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/03900/03943/index.phtml",
-                           "title": "A hitelesítés-szolgáltatókkal szembeni bizalom erősítése"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/11100/11144/index.phtml",
-                           "title": "Adatmodellezés"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/11100/11123/index.phtml",
-                           "title": "Az adatbázistervezés alapjai és titkai"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/11100/11122/index.phtml",
-                           "title": "Ember, információ, rendszer"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/05000/05099/index.phtml",
-                           "title": "Formális nyelvek"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/11700/11748/index.phtml",
-                           "title": "Mese a felhasználó központú tervezőről"
-                        },
-                        {
-                           "url": "http://nyelvek.inf.elte.hu/index.php",
-                           "title": "Prognyelvek portál"
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-                     ],
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-                  {
-                     "section": "Ada",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/01200/01256/index.phtml",
-                           "title": "Az Ada programozási nyelv"
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-                     "subsections": []
-                  },
-                  {
-                     "section": "Arduino",
-                     "entries": [
-                        {
-                           "url": "http://avr.tavir.hu",
-                           "title": "Arduino programozási kézikönyv"
-                        },
-                        {
-                           "url": "http://www.ms.sapientia.ro/~manyi/teaching/c++/cpp.pdf",
-                           "title": "Fejlett programozási technikák"
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-                     ],
-                     "subsections": []
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-                  {
-                     "section": "HTML / CSS",
-                     "entries": [
-                        {
-                           "url": "http://weblabor.hu/cikkek/cssalapjai1",
-                           "title": "CSS alapjai"
-                        },
-                        {
-                           "url": "http://nagygusztav.hu/webes-szabvanyok",
-                           "title": "Webes szabványok"
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-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/01400/01404/index.phtml",
-                           "title": "CORBA-alapú elosztott alkalmazások"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/00800/00889/index.phtml",
-                           "title": "Fantasztikus programozás"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/01300/01304/index.phtml",
-                           "title": "Hálózati alkalmazások Java nyelven"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/01700/01750/index.phtml",
-                           "title": "Hálózati alkalmazások készítése: CORBA, Java, WWW"
-                        },
-                        {
-                           "url": "http://www.ms.sapientia.ro/~manyi/index_java_techn.html",
-                           "title": "Java alapú webtechnológiák"
-                        },
-                        {
-                           "url": "http://nagygusztav.hu/java-programozas",
-                           "title": "Java programozás"
-                        },
-                        {
-                           "url": "http://www.ms.sapientia.ro/~manyi/teaching/oop/oop.pdf",
-                           "title": "Objektumorientált programozás"
-                        },
-                        {
-                           "url": "http://www.sze.hu/~varjasin/oktat.html",
-                           "title": "Programozás III."
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/01200/01263/index.phtml",
-                           "title": "RMI"
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-                     ],
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-                  },
-                  {
-                     "section": "Lego Mindstorms",
-                     "entries": [
-                        {
-                           "url": "https://hdidakt.hu/wp-content/uploads/2016/01/dw_74.pdf",
-                           "title": "A MINDSTORMS EV3 robotok programozásának alapjai"
-                        },
-                        {
-                           "url": "http://www.banyai-kkt.sulinet.hu/robotika/Segedanyag/Egyszeru_robotika.pdf",
-                           "title": "Egyszerű robotika, A Mindstorms NXT robotok programozásának alapjai"
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-                  {
-                     "section": "LISP",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/07200/07258/index.phtml",
-                           "title": "A LISP programozási nyelv"
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-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/05500/05528/index.phtml",
-                           "title": "A GNU/Linux programozása grafikus felületen"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/08700/08742/index.phtml",
-                           "title": "GNU/Linux segédprogramok használata"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": ".NET",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/10300/10384/index.phtml",
-                           "title": "C#"
-                        },
-                        {
-                           "url": "http://devportal.hu",
-                           "title": "C# programozás lépésről lépésre"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/10300/10392/index.phtml",
-                           "title": "Honlapépítés a XXI. században"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/10300/10382/index.phtml",
-                           "title": "Silverlight 4"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://nagygusztav.hu/drupal-6-alapismeretek",
-                           "title": "Drupal 6 alapismeretek"
-                        },
-                        {
-                           "url": "http://nagygusztav.hu/drupal-7-alapismeretek",
-                           "title": "Drupal 7 alapismeretek"
-                        },
-                        {
-                           "url": "http://nagygusztav.hu/web-programozas",
-                           "title": "Web programozás alapismeretek"
-                        },
-                        {
-                           "url": "http://ade.web.elte.hu/wabp/index.html",
-                           "title": "Webadatbázis-programozás"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PowerShell",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/10400/10402/index.phtml",
-                           "title": "Microsoft PowerShell 2.0"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/08400/08436/index.phtml",
-                           "title": "Bevezetés a Pythonba példákkal"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/08400/08446/index.phtml",
-                           "title": "Bevezetés a wxPythonba"
-                        },
-                        {
-                           "url": "https://mtmi.unideb.hu/pluginfile.php/554/mod_resource/content/3/thinkcspy3.pdf",
-                           "title": "Hogyan gondolkozz úgy, mint egy informatikus:Tanulás Python 3 segítségével"
-                        },
-                        {
-                           "url": "http://mek.oszk.hu/08400/08435/index.phtml",
-                           "title": "Tanuljunk meg programozni Python nyelven"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/hu/",
-                                 "title": "Django Girls Tutorial"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Windows Phone",
-                     "entries": [
-                        {
-                           "url": "http://mek.oszk.hu/10300/10393/",
-                           "title": "Windows Phone fejlesztés lépésről lépésre"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "id",
-                  "name": "Indonesian"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "https://yukcoding.id/download-ebook-android-gratis/",
-                           "title": "Android Developers Fundamental Course Concepts and Practicals (Bahasa Indonesia)"
-                        },
-                        {
-                           "url": "https://www.smashwords.com/books/view/533096",
-                           "title": "Tutorial Membuat Aplikasi Galeri Foto Android"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "https://mahirkoding.id/ebook-pemrograman-berorientasi-objek-c-pdf/",
-                           "title": "Menguasai Pemrograman Berorientasi Objek Dengan Bahasa C#"
-                        },
-                        {
-                           "url": "https://github.com/kelasterbuka/CPP_dasar-dasar-programming",
-                           "title": "Belajar C++ Dasar Bahasa Indonesia"
-                        },
-                        {
-                           "url": "https://leanpub.com/koding-cpp-qt",
-                           "title": "Koding C++ Dengan Qt"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CodeIgniter",
-                     "entries": [
-                        {
-                           "url": "https://codeigniter-id.github.io/user-guide/",
-                           "title": "Panduan Pengguna CodeIgniter Indonesia"
-                        },
-                        {
-                           "url": "https://www.petanikode.com/tutorial/codeigniter/",
-                           "title": "Tutorial CodeIgniter 3 & 4"
-                        },
-                        {
-                           "url": "http://mfikri.com/artikel/tutorial-codeigniter4",
-                           "title": "Tutorial CodeIgniter 4"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Emacs",
-                     "entries": [
-                        {
-                           "url": "https://github.com/kholidfu/emacs_doc",
-                           "title": "Dokumentasi Emacs Bahasa Indonesia"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "https://github.com/petanikode/belajar-git",
-                           "title": "Belajar Git untuk Pemula"
-                        },
-                        {
-                           "url": "https://leanpub.com/kontrol-versi-git",
-                           "title": "Kontrol Versi dengan Git"
-                        },
-                        {
-                           "url": "https://git-scm.com/book/id/v2",
-                           "title": "Pro Git 2nd Edition"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "https://raw.githubusercontent.com/gungunfebrianza/Belajar-Dengan-Jenius-Golang/master/Belajar%20Dengan%20Jenius%20Golang.pdf",
-                           "title": "Belajar Dengan Jenius Golang"
-                        },
-                        {
-                           "url": "https://dasarpemrogramangolang.novalagung.com",
-                           "title": "Dasar Pemrograman Golang"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML CSS",
-                     "entries": [
-                        {
-                           "url": "http://www.ariona.net/ebook-belajar-html-dan-css/",
-                           "title": "Belajar HTML dan CSS"
-                        },
-                        {
-                           "url": "https://www.malasngoding.com/download-ebook-belajar-html-dan-css-dasar-gratis/",
-                           "title": "Ebook Belajar HTML Dan CSS Dasar"
-                        },
-                        {
-                           "url": "https://leanpub.com/html-css--buat-webistemu-sendiri",
-                           "title": "HTML & CSS: Buat Websitemu Sendiri "
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://github.com/ifnu/buku-java-desktop/raw/master/java-desktop-ifnu-bima.pdf",
-                           "title": "Java Desktop"
-                        },
-                        {
-                           "url": "https://raw.githubusercontent.com/teten777/free-ebook-springboot-basic/master/Memulai%20Java%20Enterprise%20dengan%20Spring%20Boot.pdf",
-                           "title": "Memulai Java Enterprise dengan Spring Boot"
-                        },
-                        {
-                           "url": "https://blog.rosihanari.net/download-tutorial-java-se-gratis/",
-                           "title": "Pemrograman Java"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://masputih.com/2013/01/ebook-gratis-mengenal-javascript",
-                           "title": "Mengenal JavaScript"
-                        },
-                        {
-                           "url": "https://kristories.gitbooks.io/otomatisasi-dengan-gulp-js/content/",
-                           "title": "Otomatisasi dengan gulp.js"
-                        },
-                        {
-                           "url": "https://www.petanikode.com/tutorial/javascript/",
-                           "title": "Tutorial Dasar Javascript untuk Pemula"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "https://play.google.com/store/books/details/Onesinus_Saut_Parulian_3_Days_With_Mysql_For_Your?id=MbdTDwAAQBAJ",
-                           "title": "3 Days With Mysql For Your Application: Mysql Untuk Pemula"
-                        },
-                        {
-                           "url": "https://umardanny.com/tutorial-mysql-untuk-pemula-hingga-mahir-ebook-download-pdf/",
-                           "title": "Tutorial MySQL untuk Pemula Hingga Mahir"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Node.js",
-                     "entries": [
-                        {
-                           "url": "http://idjs.github.io/belajar-nodejs/",
-                           "title": "Belajar Node.js"
-                        },
-                        {
-                           "url": "https://play.google.com/store/books/details/Bona_Tua_Node_js_Handbook?id=9WhZDwAAQBAJ",
-                           "title": "Node.js Handbook: Berbahasa Indonesia"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "NoSQL",
-                     "entries": [
-                        {
-                           "url": "https://kristories.gitbooks.io/pengantar-mongodb/content/",
-                           "title": "MongoDB Untuk Indonesia"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Pemrograman Fungsional",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/fpmortals-id",
-                           "title": "Pemrograman Fungsional untuk Rakyat Jelata dengan Scalaz"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Pemrograman Kompetitif",
-                     "entries": [
-                        {
-                           "url": "https://osn.toki.id/#materi-algo",
-                           "title": "Pemrograman Kompetitif Dasar"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://www.slideshare.net/HasanudinHS/ebook-i-membuat-bot-telegram-dengan-php",
-                           "title": "Membuat Bot Telegram dengan PHP"
-                        },
-                        {
-                           "url": "https://arsiteknologi.com/wp-content/uploads/Pemrograman_Berbasis_Objek_Modern_dengan_PHP_Google_Play_Book.pdf",
-                           "title": "Pemrograman Berbasis Objek Modern dengan PHP"
-                        },
-                        {
-                           "url": "https://endangcahyapermana.files.wordpress.com/2016/03/belajar-singkat-pemrograman-berorientasi-objek-dengan-php5.pdf",
-                           "title": "Pemrograman Berorientasi Objek Dengan PHP5"
-                        },
-                        {
-                           "url": "http://achmatim.net/2009/04/15/buku-gratis-pemrograman-web-dengan-php-dan-mysql/",
-                           "title": "Pemrograman Web dengan PHP dan MySQL"
-                        },
-                        {
-                           "url": "http://id.phptherightway.com/#site-header/",
-                           "title": "PHP: The Right Way Bahasa Indonesia"
-                        },
-                        {
-                           "url": "http://www.ilmuwebsite.com/ebook-php-free-download",
-                           "title": "Tutorial Ebook PHP"
-                        },
-                        {
-                           "url": "https://www.petanikode.com/tutorial/php",
-                           "title": "Tutorial Pemrograman PHP untuk Pemula"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://www.belajarpython.com",
-                           "title": "Belajar Python"
-                        },
-                        {
-                           "url": "https://www.pythonindo.com/tutorial-python-dasar/",
-                           "title": "Dasar Pemrograman Python"
-                        },
-                        {
-                           "url": "https://play.google.com/store/books/details/Rolly_Maulana_Awangga_Dasar_dasar_Python?id=YpzDDwAAQBAJ",
-                           "title": "Dasar Pengenalan Pemrograman Python"
-                        },
-                        {
-                           "url": "http://rab.co.id/files/python/bukupython2.pdf.gz",
-                           "title": "Database PostgreSQL, Pemrograman Python, dan SMS Gateway"
-                        },
-                        {
-                           "url": "https://developers.google.com/machine-learning/crash-course?hl=id",
-                           "title": "Kursus Singkat Machine Learning dengan TensorFlow API"
-                        },
-                        {
-                           "url": "https://docs.python.org/id/3.8/tutorial/",
-                           "title": "Tutorial Python"
-                        },
-                        {
-                           "url": "http://sakti.github.io/python101/",
-                           "title": "Workshop Python 101"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "React",
-                     "entries": [
-                        {
-                           "url": "https://id.reactjs.org",
-                           "title": "Dokumentasi React Bahasa Indonesia"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/belajar-typescript",
-                           "title": "Belajar TypeScript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://degananda.com/tutorial-angular-indonesia-daftar-isi-download-pdf/",
-                                 "title": "Tutorial Angular Indonesia"
-                              },
-                              {
-                                 "url": "https://www.bewoksatukosong.com/2019/09/tutorial-series-belajar-angular-2019.html",
-                                 "title": "Tutorial Series Belajar Angular 2019"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Deno",
-                           "entries": [
-                              {
-                                 "url": "https://raw.githubusercontent.com/gungunfebrianza/Belajar-Dengan-Jenius-DenoTheWKWKLand/master/Belajar%20Dengan%20Jenius%20Deno.pdf",
-                                 "title": "Belajar Dengan Jenius Deno"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Vue",
-                     "entries": [
-                        {
-                           "url": "https://github.com/vuejs-id/docs",
-                           "title": "Dokumentasi Vue Bahasa Indonesia"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "it",
-                  "name": "Italian"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "0 - Agnostico",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Algoritmi e Strutture Dati",
-                           "entries": [
-                              {
-                                 "url": "https://www.sci.unich.it/~acciaro/corsoASD.pdf",
-                                 "title": "Appunti di Analisi e Progettazione di Algoritmi"
-                              },
-                              {
-                                 "url": "http://bertoni.di.unimi.it/Algoritmi_e_Strutture_Dati.pdf",
-                                 "title": "Progetto e Analisi di Algoritmi"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Metodologie di sviluppo del software",
-                           "entries": [
-                              {
-                                 "url": "http://www.diegm.uniud.it/schaerf/APS/Dispensa_APS_2_3.pdf",
-                                 "title": "Analisi e progettazione del software"
-                              },
-                              {
-                                 "url": "http://minimalprocedure.pragmas.org/writings/programmazione_funzionale/programmazione_funzionale.html",
-                                 "title": "Programmazione Funzionale"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Open source",
-                           "entries": [
-                              {
-                                 "url": "http://www.apogeonline.com/2002/libri/88-503-1065-X/ebook/pdf/OpenSource.pdf",
-                                 "title": "Open Source - Analisi di un movimento"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Sistemi",
-                           "entries": [
-                              {
-                                 "url": "https://www.disi.unige.it/person/DelzannoG/BIOMED/Programmazione-C/dispense_avanzate_C.pdf",
-                                 "title": "Programmazione di Sistema in Linguaggio C - Esempi ed esercizi"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Storia dell'informatica",
-                           "entries": [
-                              {
-                                 "url": "http://apav.it/informatica_file1.pdf",
-                                 "title": "Breve storia dell'informatica"
-                              },
-                              {
-                                 "url": "http://nid.dimi.uniud.it/computing_history/computing_history.html",
-                                 "title": "Corso di storia dell'informatica"
-                              },
-                              {
-                                 "url": "http://www.aicanet.it/storia-informatica/storia-dell-informatica-in-mondo-digitale",
-                                 "title": "La storia dell'informatica in Mondo Digitale"
-                              },
-                              {
-                                 "url": "https://www.progettohmr.it/Corso/",
-                                 "title": "STI: il corso di storia dell'Informatica"
-                              },
-                              {
-                                 "url": "http://www.dsi.unive.it/~pelillo/Didattica/Storia%20dell'informatica/",
-                                 "title": "Storia dell'informatica"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "http://www.html.it/guide/guida-android/",
-                           "title": "Guida Android"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Assembly Language",
-                     "entries": [
-                        {
-                           "url": "http://drpaulcarter.com/pcasm/",
-                           "title": "PC Assembly Language"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "BASH",
-                     "entries": [
-                        {
-                           "url": "http://www.dmi.unict.it/diraimondo/web/wp-content/uploads/classes/so/mirror-stuff/abs-guide.pdf",
-                           "title": "Guida avanzata per la bash"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://linguaggioc.altervista.org/dl/GuidaDiBeejAllaProgrammazioneDiRete.pdf",
-                           "title": "Guida di Beej alla Programmazione di Rete - Usando Socket Internet"
-                        },
-                        {
-                           "url": "https://eineki.files.wordpress.com/2010/02/guidac.pdf",
-                           "title": "Il linguaggio C - Guida pratica alla programmazione"
-                        },
-                        {
-                           "url": "http://www.itis.pr.it/~dsacco/itis/Olimpiadi-informatica/Libri-di-testo/LinguaggioC-R&K.pdf",
-                           "title": "Linguaggio C - ANSI C"
-                        },
-                        {
-                           "url": "http://www.cbmc.it/~marchettil/Tandem2016/Bellini.pdf",
-                           "title": "Linguaggio C - Guida alla programmazione"
-                        },
-                        {
-                           "url": "http://www.dmi.unict.it/diraimondo/web/wp-content/uploads/classes/so/mirror-stuff/Tricky_C.pdf",
-                           "title": "Tricky C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "http://antoniopelleriti.it/wp-content/uploads/2019/04/ABCsharp-guida-alla-programmazione-in-csharp.pdf",
-                           "title": "ABC# - Guida alla programmazione"
-                        },
-                        {
-                           "url": "http://didatticait.altervista.org/programmazione/CPP/CPP-dispense/CORSO_C.pdf",
-                           "title": "Corso C++ standard"
-                        },
-                        {
-                           "url": "https://hpc-forge.cineca.it/files/CoursesDev/public/2012%20Autumn/Introduzione%20alla%20programmazioni%20a%20oggetti%20in%20C++/corsocpp.pdf",
-                           "title": "Il linguaggio C++"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CSS",
-                     "entries": [
-                        {
-                           "url": "http://www.aiutamici.com/PortalWeb/eBook/ebook/Alessandro_Stella-Programmare_per_il_web.pdf",
-                           "title": "Guida Completa sviluppo lato Client"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Database",
-                     "entries": [
-                        {
-                           "url": "http://dbdmg.polito.it/wordpress/teaching/basi-di-dati/",
-                           "title": "Basi di Dati"
-                        },
-                        {
-                           "url": "http://www.crescenziogallo.it/unifg/medicina/TSRM/master_bioimmagini/db/Teoria_pratica_progettazione_db_relazionali.pdf",
-                           "title": "La progettazione dei database relazionali"
-                        },
-                        {
-                           "url": "http://www.brunasti.eu/unimib/bdsi/manuale-pratico-progettazione-ER-100914.pdf",
-                           "title": "Manuale pratico di disegno e progettazione dei database"
-                        },
-                        {
-                           "url": "http://www.html.it/guide/progettare-database-nosql/?cref=system",
-                           "title": "Progettare database NoSQL: la guida"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "NoSQL",
-                           "entries": [
-                              {
-                                 "url": "http://www.html.it/guide/guida-mongodb/?cref=system",
-                                 "title": "Guida MongoDB"
-                              },
-                              {
-                                 "url": "http://www.html.it/guide/guida-orientdb/?cref=system",
-                                 "title": "Guida OrientDB"
-                              },
-                              {
-                                 "url": "https://nicolaiarocci.com/mongodb/il-piccolo-libro-di-mongodb.pdf",
-                                 "title": "Il piccolo libro di MongoDB"
-                              },
-                              {
-                                 "url": "http://www.html.it/guide/redis-la-guida/?cref=system",
-                                 "title": "Redis: la guida"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Relazionali",
-                           "entries": [
-                              {
-                                 "url": "http://www.crescenziogallo.it/unifg/agraria/ISLA/SEI1/2016-2017/UD5/Guida%20MySql.pdf",
-                                 "title": "Guida a MySQL"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "SQL",
-                           "entries": [
-                              {
-                                 "url": "http://www.html.it/guide/guida-linguaggio-sql/?cref=system",
-                                 "title": "Guida linguaggio SQL"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Golang",
-                     "entries": [
-                        {
-                           "url": "http://www.vittal.it/wp-content/uploads/2019/01/golang.pdf",
-                           "title": "Golang"
-                        },
-                        {
-                           "url": "https://github.com/francescomalatesta/the-little-go-book-ita",
-                           "title": "The Little Go Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML",
-                     "entries": [
-                        {
-                           "url": "http://canoro.altervista.org/guide/html/GuidaHTML22.pdf",
-                           "title": "Canoro sito"
-                        },
-                        {
-                           "url": "http://www.aiutamici.com/PortalWeb/eBook/ebook/Alessandro_Stella-Programmare_per_il_web.pdf",
-                           "title": "Guida Completa sviluppo lato Client"
-                        },
-                        {
-                           "url": "http://www.mi.infn.it/~calcolo/corso_base_html/pdf/corso_base_html.pdf",
-                           "title": "INFN di Milano"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://www.hoepli.it/editore/hoepli_file/download_pub/978-88-203-8302-2_Java9-Appendici.pdf",
-                           "title": "Appendici del manuale di Java 9"
-                        },
-                        {
-                           "url": "https://www.emmecilab.net/blog/esercitazioni-di-spring-boot-0-come-impostare-un-progetto/",
-                           "title": "Esercitazioni di Spring Boot"
-                        },
-                        {
-                           "url": "https://www.hoepli.it/editore/hoepli_file/download_pub/978-88-203-8302-2_java9-esercizi.pdf",
-                           "title": "Esercizi del manuale di Java 9"
-                        },
-                        {
-                           "url": "http://wpage.unina.it/m.faella/Didattica/LpII/archivio.pdf",
-                           "title": "Esercizi di Java Avanzato"
-                        },
-                        {
-                           "url": "http://www.dei.unipd.it/~filira/fi/etc/eserciziario.pdf",
-                           "title": "Fondamenti di informatica - Java - Eserciziario"
-                        },
-                        {
-                           "url": "http://twiki.di.uniroma1.it/pub/Metod_prog/RS_INFO/lezioni.html",
-                           "title": "Guida a Java 8"
-                        },
-                        {
-                           "url": "http://www.html.it/guide/guida-java/?cref=development",
-                           "title": "Guida Java"
-                        },
-                        {
-                           "url": "https://it.wikibooks.org/wiki/Java",
-                           "title": "Java 7"
-                        },
-                        {
-                           "url": "https://www.html.it/guide/java-9-la-guida/",
-                           "title": "Java 9 e 10, la guida"
-                        },
-                        {
-                           "url": "http://www.digididattica.it/pluginfile.php/2127/mod_resource/content/1/javamattone.pdf",
-                           "title": "Java Mattone dopo Mattone"
-                        },
-                        {
-                           "url": "https://www.nuovojava.it/assets/download/nuovoJava-materiale_extra_online.pdf",
-                           "title": "Materiale extra online de \"Il nuovo Java\""
-                        },
-                        {
-                           "url": "http://www.claudiodesio.com/download/oo_&&_java_5.zip",
-                           "title": "Object Oriented && Java 5 (II Edizione)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://www.grimaldi.napoli.it/pdf/manuale_unite_224_2_html_1000213680.pdf",
-                           "title": "Corso completo Javascript"
-                        },
-                        {
-                           "url": "http://www.aiutamici.com/PortalWeb/eBook/ebook/Alessandro_Stella-Programmare_per_il_web.pdf",
-                           "title": "Guida Completa sviluppo lato Client"
-                        },
-                        {
-                           "url": "http://lia.deis.unibo.it/Courses/TecnologieWeb0809/materiale/laboratorio/guide/JScriptRef_Ita.pdf",
-                           "title": "Guida di riferimento"
-                        },
-                        {
-                           "url": "https://www.html.it/guide/guida-javascript-di-base/",
-                           "title": "Guida Javascript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "https://www.html.it/articoli/angularjs-il-supereroe-dei-framework-javascript-di-google/",
-                                 "title": "AngularJS, il supereroe dei framework JavaScript ...di Google"
-                              },
-                              {
-                                 "url": "https://www.html.it/guide/guida-angularjs/",
-                                 "title": "Guida AngularJS"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Kotlin",
-                     "entries": [
-                        {
-                           "url": "http://www.vittal.it/wp-content/uploads/2019/07/kotlin.pdf",
-                           "title": "Kotlin"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://profs.sci.univr.it/~gregorio/introtex.pdf",
-                           "title": "Appunti di programmazione in LaTeX e TeX"
-                        },
-                        {
-                           "url": "http://www.discretephysics.org/MANUALI/Latex.pdf",
-                           "title": "Il LaTex mediante esempi"
-                        },
-                        {
-                           "url": "https://users.dimi.uniud.it/~gianluca.gorni/TeX/itTeXdoc/impara_latex.pdf",
-                           "title": "Impara LaTeX! (... e mettilo da parte)"
-                        },
-                        {
-                           "url": "http://www.guitex.org/home/images/doc/guidaguit-b5.pdf",
-                           "title": "Introduzione all'arte della composizione tipografica con LaTeX"
-                        },
-                        {
-                           "url": "http://www.lorenzopantieri.net/LaTeX_files/ArteLaTeX.pdf",
-                           "title": "L'arte di scrivere con LaTeX"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180712171427/http://www.guit.sssup.it/downloads/LaTeX-facile.pdf",
-                           "title": "LaTeX facile"
-                        },
-                        {
-                           "url": "http://www.batmath.it/latex/pdfs/guida_st.pdf",
-                           "title": "LaTeX, naturalmente!"
-                        },
-                        {
-                           "url": "http://www.lorenzopantieri.net/LaTeX_files/LaTeXimpaziente.pdf",
-                           "title": "LaTeX per l'impaziente"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180417083215/http://www.guit.sssup.it/guitmeeting/2005/articoli/mori.pdf",
-                           "title": "Scrivere la tesi di laurea con LaTeX"
-                        },
-                        {
-                           "url": "http://www.ctan.org/tex-archive/info/lshort/italian",
-                           "title": "Una (mica tanto) breve introduzione a LATEX 2ε"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "http://archive.org/download/AppuntiDiInformaticaLibera/",
-                           "title": "«a2», ex «Appunti di informatica libera», ex «Appunti Linux»"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Livecode",
-                     "entries": [
-                        {
-                           "url": "http://www.maxvessi.net/pmwiki/pmwiki.php?n=Main.GuidaALivecode",
-                           "title": "Guida a livecode"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "http://www.webprog.net/public/corso_perl.pdf",
-                           "title": "Corso di Perl"
-                        },
-                        {
-                           "url": "http://www.aquilante.net/perl/perl.pdf",
-                           "title": "Introduzione al Perl"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://www.html.it/guide/guida-php-di-base/?cref=development",
-                           "title": "Guida PHP"
-                        },
-                        {
-                           "url": "http://francescomuscolo.altervista.org/manuale_PHP.pdf",
-                           "title": "Manuale PHP"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/it/index.html",
-                                 "title": "Symfony 5: guida rapida"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://docs.python.it/html/ref/",
-                           "title": "Il manuale di riferimento di Python"
-                        },
-                        {
-                           "url": "http://docs.python.it/html/tut/",
-                           "title": "Il tutorial di Python"
-                        },
-                        {
-                           "url": "http://gpiancastelli.altervista.org/dip3-it/",
-                           "title": "Immersione in Python 3"
-                        },
-                        {
-                           "url": "http://docs.python.it/html/lib/",
-                           "title": "La libreria di riferimento di Python"
-                        },
-                        {
-                           "url": "http://www.python.it/doc/Howtothink/Howtothink-html-it/index.htm",
-                           "title": "Pensare da Informatico, Versione Python"
-                        },
-                        {
-                           "url": "http://do1.dr-chuck.com/pythonlearn/IT_it/pythonlearn.pdf",
-                           "title": "Python per tutti: Esplorare dati con Python3"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/it/",
-                                 "title": "Il tutorial di Django Girls"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "http://tesi.cab.unipd.it/22937/1/Tesina_-_Introduzione_a_Ruby.pdf",
-                           "title": "Introduzione a Ruby"
-                        },
-                        {
-                           "url": "http://minimalprocedure.pragmas.org/writings/programmazione_elementare_ruby/corso_elementare_ruby.html",
-                           "title": "Programmazione elementare in Ruby"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20161102011319/http://ruby-it.org/rug_it.zip",
-                           "title": "Ruby User Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://www.html.it/guide/guida-typescript/",
-                           "title": "Guida TypeScript"
-                        },
-                        {
-                           "url": "https://github.com/TizioFittizio/typescript-book",
-                           "title": "TypeScript Deep Dive"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://www.html.it/guide/applicazioni-con-angular-e-php-la-guida/",
-                                 "title": "Applicazioni con Angular e PHP, la guida"
-                              },
-                              {
-                                 "url": "https://www.html.it/guide/guida-angularjs-2/",
-                                 "title": "Guida Angular 2"
-                              },
-                              {
-                                 "url": "http://vbgraphic.altervista.org/warehouse/sites/default/files/downloads/Guida_Angular5_FabioGuerrazzi.pdf",
-                                 "title": "Guida di Angular 5"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "UML",
-                     "entries": [
-                        {
-                           "url": "http://liuct.altervista.org/download/repository/ingsof/Appunti_UML.pdf",
-                           "title": "Appunti di UML"
-                        },
-                        {
-                           "url": "http://areaprofessional.com/documenti/D03_IntroGestioneProgettoSW.pdf",
-                           "title": "Introduzione alla gestione del progetto software con UML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Visual Basic",
-                     "entries": [
-                        {
-                           "url": "http://www.webalice.it/kindofapple/corsovb.pdf",
-                           "title": "Corso Visual Basic"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "ja",
-                  "name": "Japanese"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "0 - 言語非依存",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "アクセシビリティ",
-                           "entries": [
-                              {
-                                 "url": "https://developer.mozilla.org/ja/docs/ARIA/Accessible_Rich_Internet_Applications",
-                                 "title": "Accessible Rich Internet Applications"
-                              },
-                              {
-                                 "url": "https://developer.apple.com/jp/accessibility/ios",
-                                 "title": "iOS アクセシビリティ プログラミング ガイド"
-                              },
-                              {
-                                 "url": "https://msdn.microsoft.com/ja-jp/library/windows/apps/hh700407.aspx",
-                                 "title": "アクセシビリティのための設計"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "オープンソースエコシステム",
-                           "entries": [
-                              {
-                                 "url": "https://opensource.guide/ja/",
-                                 "title": "オープンソースガイドライン"
-                              },
-                              {
-                                 "url": "https://producingoss.com/ja/",
-                                 "title": "オープンソースソフトウェアの育て方"
-                              },
-                              {
-                                 "url": "https://github.com/oss-gate/first-feedback-guidebook",
-                                 "title": "これでできる！ はじめてのOSSフィードバックガイド ～ #駆け出しエンジニアと繋がりたい と言ってた私が野生のつよいエンジニアとつながるのに必要だったこと～"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "ガベージコレクション",
-                           "entries": [
-                              {
-                                 "url": "http://matsu-www.is.titech.ac.jp/~endo/gc/gc.pdf",
-                                 "title": "一般教養としてのGarbage Collection"
-                              },
-                              {
-                                 "url": "https://github.com/authorNari/g1gc-impl-book/",
-                                 "title": "徹底解剖「G1GC」実装編"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "グラフィックスプログラミング",
-                           "entries": [
-                              {
-                                 "url": "https://docs.microsoft.com/ja-jp/windows/uwp/gaming/directx-programming",
-                                 "title": "DirectX プログラミング"
-                              },
-                              {
-                                 "url": "https://www.wakayama-u.ac.jp/~tokoi/opengl/libglut.html",
-                                 "title": "GLUTによる「手抜き」OpenGL入門"
-                              },
-                              {
-                                 "url": "https://developer.apple.com/jp/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Introduction/Introduction.html",
-                                 "title": "iOS OpenGL ES プログラミングガイド"
-                              },
-                              {
-                                 "url": "https://colorful-pico.net/introduction-to-addon-development-in-blender/2.7/",
-                                 "title": "はじめてのBlenderアドオン開発 (Blender 2.7版)"
-                              },
-                              {
-                                 "url": "http://www.natural-science.or.jp/laboratory/opengl_intro.php",
-                                 "title": "仮想物理実験室構築のためのOpenGL, WebGL, GLSL入門"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "グラフィックユーザーインターフェイス",
-                           "entries": [
-                              {
-                                 "url": "https://densan-labs.net/tech/qt",
-                                 "title": "Qtプログラミング入門"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "コンテナ",
-                           "entries": [
-                              {
-                                 "url": "https://docs.docker.jp",
-                                 "title": "Docker-docs-ja"
-                              },
-                              {
-                                 "url": "https://kubernetes.io/ja/docs/tutorials",
-                                 "title": "チュートリアル | Kubernetes"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "セキュリティ",
-                           "entries": [
-                              {
-                                 "url": "http://www.cybersyndrome.net/rsa",
-                                 "title": "RSA暗号体験入門"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000017319.pdf",
-                                 "title": "ウェブ健康診断仕様"
-                              },
-                              {
-                                 "url": "https://herumi.github.io/ango",
-                                 "title": "クラウドを支えるこれからの暗号技術"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/security/awareness/vendor/programming",
-                                 "title": "セキュア・プログラミング講座"
-                              },
-                              {
-                                 "url": "https://www.mew.org/~kazu/doc/rsa.html",
-                                 "title": "はやわかり RSA"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000017320.pdf",
-                                 "title": "安全なSQLの呼び出し方"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000017316.pdf",
-                                 "title": "安全なウェブサイトの作り方"
-                              },
-                              {
-                                 "url": "https://fussy.web.fc2.com/algo/algo9-1.htm",
-                                 "title": "暗号化アルゴリズム ([1])"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "その他の話題",
-                           "entries": [
-                              {
-                                 "url": "https://tatsu-zine.com/books/kk1",
-                                 "title": "ケヴィン・ケリー著作選集　１"
-                              },
-                              {
-                                 "url": "https://tatsu-zine.com/books/kk2",
-                                 "title": "ケヴィン・ケリー著作選集　２"
-                              },
-                              {
-                                 "url": "https://tatsu-zine.com/books/kk3",
-                                 "title": "ケヴィン・ケリー著作選集　３"
-                              },
-                              {
-                                 "url": "http://www.aoky.net",
-                                 "title": "青木靖 翻訳集"
-                              },
-                              {
-                                 "url": "https://practical-scheme.net/index-j.html",
-                                 "title": "川合史朗 翻訳集"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "ソフトウェアアーキテクチャ",
-                           "entries": [
-                              {
-                                 "url": "https://www.hyuki.com/dp/cat_index.html",
-                                 "title": "ギコ猫とデザインパターン"
-                              },
-                              {
-                                 "url": "https://www.techscore.com/tech/DesignPattern",
-                                 "title": "デザインパターン"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "ソフトウェア開発方法論",
-                           "entries": [
-                              {
-                                 "url": "https://www.infoq.com/jp/minibooks/scrum-xp-from-the-trenches",
-                                 "title": "塹壕より Scrum と  XP"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "ソフトウェア品質",
-                           "entries": [
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005144.pdf",
-                                 "title": "高信頼化ソフトウェアのための開発手法ガイドブック"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005118.pdf",
-                                 "title": "組込みシステムの安全性向上の勧め（機能安全編）"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005105.pdf",
-                                 "title": "組込みソフトウェア開発におけるプロジェクトマネジメント導入の勧め"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000027629.pdf",
-                                 "title": "組込みソフトウェア開発における品質向上の勧め [バグ管理手法編]"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005114.pdf",
-                                 "title": "組込みソフトウェア開発における品質向上の勧め [ユーザビリティ編]"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005113.pdf",
-                                 "title": "組込みソフトウェア開発における品質向上の勧め [設計モデリング編]"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005106.pdf",
-                                 "title": "組込みソフトウェア開発における品質向上の勧め（コーディング編）"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005149.pdf",
-                                 "title": "組込みソフトウェア開発における品質向上の勧め［テスト編～事例集～］"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "データベース",
-                           "entries": [
-                              {
-                                 "url": "http://www.ipa.go.jp/files/000018652.pdf",
-                                 "title": "データベース"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "ネットワーキング",
-                           "entries": [
-                              {
-                                 "url": "https://http3-explained.haxx.se/ja",
-                                 "title": "HTTP/3 explained"
-                              },
-                              {
-                                 "url": "https://http2-explained.haxx.se/ja",
-                                 "title": "http2 explained"
-                              },
-                              {
-                                 "url": "http://x68000.q-e-d.net/~68user/net",
-                                 "title": "ネットワークプログラミングの基礎知識"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "機械学習",
-                           "entries": [
-                              {
-                                 "url": "http://jubat.us/ja",
-                                 "title": "Jubatus : オンライン機械学習向け分散処理フレームワーク"
-                              },
-                              {
-                                 "url": "https://gihyo.jp/dev/serial/01/mahout",
-                                 "title": "Mahoutで体感する機械学習の実践"
-                              },
-                              {
-                                 "url": "https://gihyo.jp/dev/serial/01/machine-learning",
-                                 "title": "機械学習 はじめよう"
-                              },
-                              {
-                                 "url": "https://github.com/komi1230/Resume/raw/master/book_reinforcement/book.pdf",
-                                 "title": "強化学習入門"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "正規表現",
-                           "entries": [
-                              {
-                                 "url": "https://docs.microsoft.com/ja-jp/dotnet/standard/base-types/regular-expressions",
-                                 "title": ".NET の正規表現"
-                              },
-                              {
-                                 "url": "http://www.kt.rim.or.jp/~kbk/regex/regex.html",
-                                 "title": "正規表現メモ"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "組み込みシステム",
-                           "entries": [
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005146.pdf",
-                                 "title": "【改訂版】 組込みソフトウェア開発向け 品質作り込みガイド"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005126.pdf",
-                                 "title": "【改訂版】 組込みソフトウェア向け 開発プロセスガイド"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/sec/publish/tn18-004.html",
-                                 "title": "【改訂版】組込みソフトウェア開発向け コーディング作法ガイド［C言語版］ESCR Ver.3.0"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/sec/publish/tn16-007.html",
-                                 "title": "【改訂版】組込みソフトウェア開発向けコーディング作法ガイド[C++言語版] Ver. 2.0 （ESCR C++ Ver. 2.0）"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005116.pdf",
-                                 "title": "組込みソフトウェア向け プロジェクトマネジメントガイド［計画書編］"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005145.pdf",
-                                 "title": "組込みソフトウェア向け プロジェクト計画立案トレーニングガイド"
-                              },
-                              {
-                                 "url": "https://www.ipa.go.jp/files/000005148.pdf",
-                                 "title": "組込みソフトウェア向け 設計ガイド ESDR［事例編］"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "並列プログラミング",
-                           "entries": [
-                              {
-                                 "url": "https://jp.xlsoft.com/documents/intel/compiler/525J-001.pdf",
-                                 "title": "インテル コンパイラー OpenMP 入門"
-                              },
-                              {
-                                 "url": "https://www.cc.u-tokyo.ac.jp/support/press/news/VOL12/No1/201001gpgpu.pdf",
-                                 "title": "これからの並列計算のためのGPGPU連載講座 [I]"
-                              },
-                              {
-                                 "url": "https://www.cc.u-tokyo.ac.jp/support/press/news/VOL13/No1/Rensai201101.pdf",
-                                 "title": "連載講座: 高生産並列言語を使いこなす [1]"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "理論計算機科学",
-                           "entries": [
-                              {
-                                 "url": "https://sicp.iijlab.net/fulltext",
-                                 "title": "計算機プログラムの構造と解釈 第二版"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "https://github.com/TechBooster/AndroidOpenTextbook",
-                           "title": "Android Open Text book"
-                        },
-                        {
-                           "url": "https://www.jssec.org/report/securecoding.html",
-                           "title": "Android アプリのセキュア設計・セキュアコーディングガイド"
-                        },
-                        {
-                           "url": "https://gist.github.com/nobuoka/6546813",
-                           "title": "Android アプリ開発のための Java 入門"
-                        },
-                        {
-                           "url": "https://mixi-inc.github.io/AndroidTraining/",
-                           "title": "AndroidTraining"
-                        },
-                        {
-                           "url": "http://www.textdrop.net/android/code-style-ja.html",
-                           "title": "コントリビュータのためのAndroidコードスタイルガイドライン 日本語訳"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "AppleScript",
-                     "entries": [
-                        {
-                           "url": "http://www.asahi-net.or.jp/~va5n-okmt/factory/applescript/sample_code",
-                           "title": "Applescript のごく基本的なサンプル"
-                        },
-                        {
-                           "url": "https://sites.google.com/site/zzaatrans/home/applescriptlangguide",
-                           "title": "AppleScript 言語ガイド(改訂版)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "AWK",
-                     "entries": [
-                        {
-                           "url": "https://www.magata.net/memo/index.php?plugin=attach&pcmd=open&file=awk%A5%DE%A5%CB%A5%E5%A5%A2%A5%EB.pdf&refer=%A5%B7%A5%A7%A5%EB%A5%B3%A5%DE%A5%F3%A5%C9",
-                           "title": "AWK の第一歩"
-                        },
-                        {
-                           "url": "https://shellscript.sunone.me/awk.html",
-                           "title": "AWK リファレンス"
-                        },
-                        {
-                           "url": "http://www.kt.rim.or.jp/~kbk/gawk-30/gawk_toc.html",
-                           "title": "Effective AWK Programming"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Bash",
-                     "entries": [
-                        {
-                           "url": "https://linuxjf.osdn.jp/JFdocs/Bash-Prog-Intro-HOWTO.html",
-                           "title": "BASH Programming - Introduction HOW-TO"
-                        },
-                        {
-                           "url": "https://d.hatena.ne.jp/nattou_curry_2/20100131/1264910483",
-                           "title": "Bash 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://yakst.com/ja/posts/2929",
-                           "title": "Bashのよくある間違い"
-                        },
-                        {
-                           "url": "https://github.com/jlevy/the-art-of-command-line/blob/master/README-ja.md",
-                           "title": "The Art of Command Line"
-                        },
-                        {
-                           "url": "https://shellscript.sunone.me",
-                           "title": "UNIX & Linux コマンド・シェルスクリプト リファレンス"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://www.pro.or.jp/~fuji/mybooks/cdiag",
-                           "title": "Ｃプログラミング診断室"
-                        },
-                        {
-                           "url": "https://ja.wikibooks.org/wiki/C%E8%A8%80%E8%AA%9E",
-                           "title": "C言語"
-                        },
-                        {
-                           "url": "https://docs.microsoft.com/ja-jp/cpp/c-language",
-                           "title": "C言語のドキュメント"
-                        },
-                        {
-                           "url": "https://densan-labs.net/tech/clang",
-                           "title": "C言語プログラミング入門"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/linux/clang.html",
-                           "title": "お気楽Ｃ言語プログラミング超入門"
-                        },
-                        {
-                           "url": "https://densan-labs.net/tech/game",
-                           "title": "ゲーム作りで学ぶ！実践的C言語プログラミング"
-                        },
-                        {
-                           "url": "https://9cguide.appspot.com",
-                           "title": "苦しんで覚えるＣ言語"
-                        },
-                        {
-                           "url": "http://cms.phys.s.u-tokyo.ac.jp/~naoki/CIPINTRO",
-                           "title": "計算物理のためのC/C++言語入門"
-                        },
-                        {
-                           "url": "http://kumei.ne.jp/c_lang",
-                           "title": "猫でもわかるプログラミング"
-                        },
-                        {
-                           "url": "https://ezoeryou.github.io/cpp-book/C++11-Syntax-and-Feature.xhtml",
-                           "title": "C++11の文法と機能(C++11: Syntax and Feature)"
-                        },
-                        {
-                           "url": "https://www.asahi-net.or.jp/~yf8k-kbys/newcpp0.html",
-                           "title": "C++入門"
-                        },
-                        {
-                           "url": "https://cpprefjp.github.io",
-                           "title": "cpprefjp - C++ Reference Site in Japanese"
-                        },
-                        {
-                           "url": "https://ttsuki.github.io/styleguide/cppguide.ja.html",
-                           "title": "Google C++ スタイルガイド 日本語全訳"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170607163002/http://episteme.wankuma.com/stlprog",
-                           "title": "Standard Template Library プログラミング"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/linux/cpp.html",
-                           "title": "お気楽Ｃ++プログラミング超入門"
-                        },
-                        {
-                           "url": "http://www7b.biglobe.ne.jp/~robe/cpphtml",
-                           "title": "ロベールのＣ＋＋教室"
-                        },
-                        {
-                           "url": "https://ezoeryou.github.io/cpp-intro",
-                           "title": "江添亮のC++入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Clojure",
-                     "entries": [
-                        {
-                           "url": "https://github.com/totakke/clojure-style-guide",
-                           "title": "Clojureスタイルガイド"
-                        },
-                        {
-                           "url": "https://github.com/TranslateBabelJapan/modern-cljs",
-                           "title": "Modern cljs(翻訳中)"
-                        },
-                        {
-                           "url": "https://github.com/making/rd-clj",
-                           "title": "逆引きClojure"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CoffeeScript",
-                     "entries": [
-                        {
-                           "url": "http://memo.sappari.org/coffeescript/coffeescript-langref",
-                           "title": "CoffeeScript 言語リファレンス"
-                        },
-                        {
-                           "url": "https://blog.bokuweb.me/entry/2015/01/06/190240",
-                           "title": "CoffeeScript基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://minghai.github.io/library/coffeescript",
-                           "title": "The Little Book on CoffeeScript"
-                        },
-                        {
-                           "url": "https://kyu-mu.net/coffeescript/revref",
-                           "title": "基本操作逆引きリファレンス（CoffeeScript）"
-                        },
-                        {
-                           "url": "https://kyu-mu.net/coffeescript/regexp",
-                           "title": "正規表現リファレンス（CoffeeScript)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Common Lisp",
-                     "entries": [
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/xyzzy_lisp.html#abclisp",
-                           "title": "Common Lisp 入門"
-                        },
-                        {
-                           "url": "https://lisphub.jp/doc/google-common-lisp-style-guide/lispguide.xml",
-                           "title": "Google Common Lisp スタイルガイド 日本語訳"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20060526095202/http://home.soka.ac.jp/~unemi/LispProlog",
-                           "title": "LISP and PROLOG"
-                        },
-                        {
-                           "url": "http://www.asahi-net.or.jp/~kc7k-nd",
-                           "title": "On Lisp (草稿)"
-                        },
-                        {
-                           "url": "http://lambda.bugyo.tk/cdr/mwl",
-                           "title": "マンガで分かるLisp(Manga Guide to Lisp)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Coq",
-                     "entries": [
-                        {
-                           "url": "http://proofcafe.org/sf",
-                           "title": "ソフトウェアの基礎"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "D",
-                     "entries": [
-                        {
-                           "url": "https://gist.github.com/repeatedly/2470712",
-                           "title": "D言語基礎文法最速マスター"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Elixir",
-                     "entries": [
-                        {
-                           "url": "https://qiita.com/niku/items/729ece76d78057b58271",
-                           "title": "Elixir 基礎文法最速マスター"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Emacs Lisp",
-                     "entries": [
-                        {
-                           "url": "https://d.hatena.ne.jp/rubikitch/20100201/elispsyntax",
-                           "title": "Emacs Lisp基礎文法最速マスター"
-                        },
-                        {
-                           "url": "http://www.fan.gr.jp/~ring/doc/elisp_20/elisp.html",
-                           "title": "GNU Emacs Lispリファレンスマニュアル"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Erlang",
-                     "entries": [
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/func/erlang.html",
-                           "title": "お気楽 Erlang プログラミング入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "https://rogerdudler.github.io/git-guide/index.ja.html",
-                           "title": "git - 簡単ガイド"
-                        },
-                        {
-                           "url": "https://cdn8.atwikiimg.com/git_jp/pub/git-manual-jp/Documentation/user-manual.html",
-                           "title": "Git ユーザマニュアル (バージョン 1.5.3 以降用)"
-                        },
-                        {
-                           "url": "https://github.com/tiimgreen/github-cheat-sheet/blob/master/README.ja.md",
-                           "title": "GitHubカンニング・ペーパー"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/ja/",
-                           "title": "Pro Git"
-                        },
-                        {
-                           "url": "https://o2project.github.io/steins-git",
-                           "title": "Steins;Git 第二版"
-                        },
-                        {
-                           "url": "https://backlog.com/ja/git-tutorial",
-                           "title": "サルでもわかるGit入門"
-                        },
-                        {
-                           "url": "https://github.com/hatena/Git-for-Designers",
-                           "title": "デザイナのための Git"
-                        },
-                        {
-                           "url": "https://marklodato.github.io/visual-git-guide/index-ja.html",
-                           "title": "図解 Git"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "https://knsh14.github.io/translations/go-codereview-comments",
-                           "title": "Go Codereview Comments"
-                        },
-                        {
-                           "url": "https://astaxie.gitbooks.io/build-web-application-with-golang/content/ja",
-                           "title": "Go Web プログラミング"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/golang",
-                           "title": "お気楽 Go 言語プログラミング入門"
-                        },
-                        {
-                           "url": "https://www.spinute.org/go-by-example",
-                           "title": "サンプルで学ぶ Go 言語"
-                        },
-                        {
-                           "url": "https://andmorefine.gitbook.io/learn-go-with-tests/",
-                           "title": "テスト駆動開発でGO言語を学びましょう"
-                        },
-                        {
-                           "url": "https://gihyo.jp/dev/feature/01/go_4beginners",
-                           "title": "はじめてのGo―シンプルな言語仕様，型システム，並行処理"
-                        },
-                        {
-                           "url": "http://go.shibu.jp",
-                           "title": "プログラミング言語 Go ドキュメント"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Groovy",
-                     "entries": [
-                        {
-                           "url": "https://grails.jp/g_mag_jp",
-                           "title": "JGGUG G*Magazine"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Gradle",
-                           "entries": [
-                              {
-                                 "url": "http://gradle.monochromeroad.com/docs",
-                                 "title": "Gradle 日本語ドキュメント"
-                              },
-                              {
-                                 "url": "https://www.ntts.co.jp/column/tec/java_03/",
-                                 "title": "ビルドツールGradleスタートアップガイドの紹介"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Grails",
-                           "entries": [
-                              {
-                                 "url": "https://grails.jp/doc/latest",
-                                 "title": "Grailsフレームワーク 日本語リファレンス"
-                              },
-                              {
-                                 "url": "https://www.ntts.co.jp/column/tec/java_02/",
-                                 "title": "Grailsを用いたファイルアップローダ作成"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spock Framework",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/yamkazu/spock-workshop/tree/master/docs",
-                                 "title": "G*ワークショップZ May 2013 - Spockハンズオンの資料"
-                              },
-                              {
-                                 "url": "https://spock-framework-reference-documentation-ja.readthedocs.org/ja/latest",
-                                 "title": "Spock Framework リファレンスドキュメント"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "https://www.shido.info/hs",
-                           "title": "Haskell のお勉強"
-                        },
-                        {
-                           "url": "https://ruicc.hatenablog.jp/entry/20100131/1264905896",
-                           "title": "Haskell 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://aiya000.gitbooks.io/haskell_de_groupstructure",
-                           "title": "Haskellでわかる代数的構造"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/func/haskell.html",
-                           "title": "お気楽 Haskell プログラミング入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "iOS",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20170507034234/http://hmdt.jp/tips/cocoa/index.html",
-                           "title": "Cocoa Programming Tips 1001"
-                        },
-                        {
-                           "url": "https://developer.apple.com/jp/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/Introduction/Introduction.html",
-                           "title": "iOSアプリケーション プログラミングガイド"
-                        },
-                        {
-                           "url": "http://tutorial.rubymotion.jp",
-                           "title": "RubyMotion Tutorial: Ruby で iOS アプリを作ろう"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://d.hatena.ne.jp/nattou_curry_2/20100130/1264821094",
-                           "title": "Java基礎文法最速マスター"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/java",
-                           "title": "お気楽 Java プログラミング入門"
-                        },
-                        {
-                           "url": "http://seiza.dip.jp/link/files/writingrobustjavacode.pdf",
-                           "title": "頑健なJavaプログラムの書き方"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://mitsuruog.github.io/javascript-style-guide",
-                           "title": "Airbnb JavaScript スタイルガイド"
-                        },
-                        {
-                           "url": "https://w.atwiki.jp/aias-jsstyleguide2",
-                           "title": "Google JavaScript スタイルガイド"
-                        },
-                        {
-                           "url": "https://bonsaiden.github.io/JavaScript-Garden/ja",
-                           "title": "JavaScript Garden"
-                        },
-                        {
-                           "url": "https://azu.gitbooks.io/javascript-plugin-architecture/content",
-                           "title": "JavaScript Plugin Architecture"
-                        },
-                        {
-                           "url": "https://jsprimer.net",
-                           "title": "JavaScript Primer"
-                        },
-                        {
-                           "url": "https://azu.github.io/promises-book",
-                           "title": "JavaScript Promiseの本"
-                        },
-                        {
-                           "url": "https://developer.mozilla.org/ja/docs/JavaScript_style_guide",
-                           "title": "JavaScript style guide"
-                        },
-                        {
-                           "url": "https://gifnksm.hatenablog.jp/entry/20100131/1264934942",
-                           "title": "JavaScript 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://msdn.microsoft.com/ja-jp/library/d1et7k7c.aspx",
-                           "title": "JavaScript 言語リファレンス"
-                        },
-                        {
-                           "url": "https://developer.mozilla.org/ja/docs/Web/JavaScript",
-                           "title": "Mozilla Developer Network 日本語ドキュメント"
-                        },
-                        {
-                           "url": "https://the-little-book-of-busterjs.readthedocs.io/en/latest",
-                           "title": "The little book of Buster.JS"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/light/javascript.html",
-                           "title": "お気楽 JavaScript プログラミング超入門"
-                        },
-                        {
-                           "url": "https://www.tohoho-web.com/js",
-                           "title": "とほほのJavaScriptリファレンス"
-                        },
-                        {
-                           "url": "http://www.openspc2.org/JavaScript",
-                           "title": "一撃必殺JavaScript日本語リファレンス"
-                        },
-                        {
-                           "url": "https://kenju.gitbooks.io/js_step-up-to-intermediate",
-                           "title": "中上級者になるためのJavaScript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "https://js.studio-kingdom.com/angularjs",
-                                 "title": "AngularJS 1.2 日本語リファレンス"
-                              },
-                              {
-                                 "url": "http://lab.hisasann.com/AngularJSTutorial",
-                                 "title": "AngularJS's tutorial - あなたとともにAngularJS"
-                              },
-                              {
-                                 "url": "https://github.com/mgechev/angularjs-style-guide/blob/master/README-ja-jp.md",
-                                 "title": "AngularJSスタイルガイド"
-                              },
-                              {
-                                 "url": "https://8th713.github.io/LearnAngularJS",
-                                 "title": "すぐできる AngularJS"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Backbone.js",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/enja-oss/Backbone",
-                                 "title": "Backboneドキュメント日本語訳"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "jQuery",
-                           "entries": [
-                              {
-                                 "url": "https://stacktrace.jp/jquery/ui",
-                                 "title": "jQuery UI API 1.8.4 日本語リファレンス"
-                              },
-                              {
-                                 "url": "http://semooh.jp/jquery",
-                                 "title": "jQuery日本語リファレンス"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "https://popkirby.github.io/contents/nodeguide/style.html",
-                                 "title": "Felix's Node.js Style Guide"
-                              },
-                              {
-                                 "url": "https://github.com/omatoro/NodeSample",
-                                 "title": "node.js 怒濤の50サンプル!! – socket.io編"
-                              },
-                              {
-                                 "url": "https://www.nodebeginner.org/index-jp.html",
-                                 "title": "Nodeビギナーズブック"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React",
-                           "entries": [
-                              {
-                                 "url": "https://js.studio-kingdom.com/react",
-                                 "title": "React 0.13 日本語リファレンス"
-                              },
-                              {
-                                 "url": "https://ja.reactjs.org/tutorial/tutorial.html",
-                                 "title": "チュートリアル：React の導入"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Julia",
-                     "entries": [
-                        {
-                           "url": "https://stats.biopapyrus.jp/julia",
-                           "title": "Julia 0.3.8"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/light/julia.html",
-                           "title": "Julia Language Programming"
-                        },
-                        {
-                           "url": "https://www.dropbox.com/s/lk7y8lifjcr1vf2/JuliaBook-20151201.pdf",
-                           "title": "実例で学ぶ Julia-0.4.1"
-                        },
-                        {
-                           "url": "https://github.com/cometscome/Julianotes",
-                           "title": "物理で使う数値計算入門：Julia言語による簡単数値計算"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "https://ja.wikibooks.org/wiki/TeX/LaTeX%E5%85%A5%E9%96%80",
-                           "title": "TeX/LaTeX入門"
-                        },
-                        {
-                           "url": "https://www.comp.tmu.ac.jp/tsakai/lectures/intro_tex.html",
-                           "title": "TeX入門"
-                        },
-                        {
-                           "url": "https://texwiki.texjp.org/?TeX%E5%85%A5%E9%96%80",
-                           "title": "TeX入門 TeX Wiki"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "https://www.mech.tohoku-gakuin.ac.jp/rde/contents/linux/drivers/indexframe.html",
-                           "title": "Linux Device Driver"
-                        },
-                        {
-                           "url": "https://lfsbookja.osdn.jp/7.4.ja/",
-                           "title": "Linux from Scratch (Version 7.4)"
-                        },
-                        {
-                           "url": "https://linuxjf.osdn.jp/JFdocs/Secure-Programs-HOWTO",
-                           "title": "Secure Programming for Linux and Unix HOWTO"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lua",
-                     "entries": [
-                        {
-                           "url": "http://milkpot.sakura.ne.jp/lua/lua52_manual_ja.html",
-                           "title": "Lua 5.2 リファレンスマニュアル"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/light/lua.html",
-                           "title": "Lua Programming"
-                        },
-                        {
-                           "url": "https://densan-labs.net/tech/lua",
-                           "title": "Luaプログラミング入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Maven",
-                     "entries": [
-                        {
-                           "url": "https://www.techscore.com/tech/Java/ApacheJakarta/Maven",
-                           "title": "Maven"
-                        },
-                        {
-                           "url": "https://github.com/KengoTODA/what-is-maven",
-                           "title": "What is Maven?"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Mercurial",
-                     "entries": [
-                        {
-                           "url": "http://foozy.bitbucket.org/hgbook-ja/index.ja.html",
-                           "title": "Mercurial: The Definitive Guide"
-                        },
-                        {
-                           "url": "https://mmitou.hatenadiary.org/entry/20100501/1272680474",
-                           "title": "Mercurial チュートリアル hginit.com の和訳"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "ML",
-                     "entries": [
-                        {
-                           "url": "http://jats-ug.metasepi.org/doc/ATS2/INT2PROGINATS",
-                           "title": "ATSプログラミング入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "NoSQL",
-                     "entries": [
-                        {
-                           "url": "https://hibari.github.io/hibari-doc/hibari-app-developer-guide.ja.html",
-                           "title": "Hibari アプリケーション開発者ガイド"
-                        },
-                        {
-                           "url": "https://www.cuspy.org/diary/2012-04-17/the-little-mongodb-book-ja.pdf",
-                           "title": "MongoDBの薄い本"
-                        },
-                        {
-                           "url": "https://github.com/craftgear/the-little-redis-book",
-                           "title": "The Little Redis Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Objective-C",
-                     "entries": [
-                        {
-                           "url": "http://www.textdrop.net/google-styleguide-ja/objcguide.xml",
-                           "title": "Google Objective-C スタイルガイド 日本語訳"
-                        },
-                        {
-                           "url": "https://marycore.jp/prog/objective-c/basic-syntax",
-                           "title": "Objective-C 2.0 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://developer.apple.com/jp/devcenter/ios/library/documentation/ProgrammingWithObjectiveC.pdf",
-                           "title": "Objective-C によるプログラミング"
-                        },
-                        {
-                           "url": "https://developer.apple.com/jp/devcenter/ios/library/documentation/CocoaEncyclopedia.pdf",
-                           "title": "Objective-C プログラミングの概念"
-                        },
-                        {
-                           "url": "https://developer.apple.com/jp/documentation/ProgrammingWithObjectiveC.pdf",
-                           "title": "Objective-C プログラミング言語"
-                        },
-                        {
-                           "url": "https://fn7.hatenadiary.org/entry/20100203/1265207098",
-                           "title": "Objective-C 最速基礎文法マスター"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "OCaml",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20161128072705/http://www.fos.kuis.kyoto-u.ac.jp:80/~t-sekiym/classes/isle4/mltext/ocaml.html",
-                           "title": "Objective Caml 入門"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/func/ocaml.html",
-                           "title": "お気楽 OCaml プログラミング入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "https://qntm.org/files/perl/perl_jp.html",
-                           "title": "2時間半で学ぶPerl"
-                        },
-                        {
-                           "url": "https://ja.wikibooks.org/wiki/Perl",
-                           "title": "Perl"
-                        },
-                        {
-                           "url": "https://github.com/hatena/Hatena-Textbook/blob/master/database-programming-perl.md",
-                           "title": "Perl でのデータベース操作"
-                        },
-                        {
-                           "url": "https://perldoc.jp/index/core",
-                           "title": "Perl のコアドキュメント"
-                        },
-                        {
-                           "url": "https://tutorial.perlzemi.com/blog/20091226126425.html",
-                           "title": "Perl 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/linux/perl.html",
-                           "title": "お気楽 Perl プログラミング超入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20140703001758/http://www.doyouphp.jp/book/book_phpdp.shtml",
-                           "title": "PHP によるデザインパターン入門"
-                        },
-                        {
-                           "url": "https://www.php.net/manual/ja",
-                           "title": "PHP マニュアル"
-                        },
-                        {
-                           "url": "https://www.1x1.jp/blog/2010/01/php-basic-syntax.html",
-                           "title": "PHP 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://prev.net-newbie.com/support/pdf2/",
-                           "title": "PHP4徹底攻略改訂版"
-                        },
-                        {
-                           "url": "https://github.com/maosanhioro/fig-standards/blob/master/translation/PSR-2-coding-style-guide.md",
-                           "title": "PSR-2 – コーディングスタイルガイド"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/ja",
-                                 "title": "Symfony 5: ファストトラック"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "PowerShell",
-                     "entries": [
-                        {
-                           "url": "https://docs.microsoft.com/ja-jp/powershell/scripting/overview?view=powershell-6",
-                           "title": "PowerShell スクリプト"
-                        },
-                        {
-                           "url": "http://winscript.jp/powershell/202",
-                           "title": "PowerShell基礎文法最速マスター"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Processing",
-                     "entries": [
-                        {
-                           "url": "http://www.musashinodenpa.com/p5",
-                           "title": "Processing クイックリファレンス"
-                        },
-                        {
-                           "url": "https://www.d-improvement.jp/learning/processing",
-                           "title": "Processing 学習ノート"
-                        },
-                        {
-                           "url": "http://ap.kakoku.net/index.html",
-                           "title": "Processing 入門講座"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Prolog",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20060526095202/http://home.soka.ac.jp/~unemi/LispProlog/",
-                           "title": "LISP and PROLOG"
-                        },
-                        {
-                           "url": "https://tamura70.gitlab.io/web-prolog/intro",
-                           "title": "Prolog プログラミング入門"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/prolog",
-                           "title": "お気楽 Prolog プログラミング入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://diveintopython3-ja.rdy.jp",
-                           "title": "Dive Into Python 3 日本語版"
-                        },
-                        {
-                           "url": "http://works.surgo.jp/translation/pyguide.html",
-                           "title": "Google Python スタイルガイド"
-                        },
-                        {
-                           "url": "http://japanichaos.appspot.com",
-                           "title": "Notes on scientific computing with python"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20160813152046/http://phpy.readthedocs.io/en/latest/",
-                           "title": "php プログラマのための Python チュートリアル"
-                        },
-                        {
-                           "url": "https://stats.biopapyrus.jp/python",
-                           "title": "Python 3.4"
-                        },
-                        {
-                           "url": "http://turbare.net/transl/scipy-lecture-notes",
-                           "title": "Python Scientific Lecture Notes"
-                        },
-                        {
-                           "url": "https://aidiary.hatenablog.com/entry/20110514/1305377659",
-                           "title": "Python で音声信号処理"
-                        },
-                        {
-                           "url": "http://www.s12600.net/psy/python",
-                           "title": "python で心理実験"
-                        },
-                        {
-                           "url": "https://docs.python.org/ja",
-                           "title": "Python ドキュメント日本語訳"
-                        },
-                        {
-                           "url": "https://www.nltk.org/book-jp/ch12.html",
-                           "title": "Python による日本語自然言語処理"
-                        },
-                        {
-                           "url": "https://skitazaki.github.io/python-school-ja",
-                           "title": "Python の学習"
-                        },
-                        {
-                           "url": "https://python-guide-ja.readthedocs.io/en/latest",
-                           "title": "Python ヒッチハイク・ガイド"
-                        },
-                        {
-                           "url": "https://methane.github.io/gevent-tutorial-ja",
-                           "title": "Python プログラマーのための gevent チュートリアル"
-                        },
-                        {
-                           "url": "https://dplusplus.hatenablog.com/entry/20100126/p1",
-                           "title": "Python 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://sites.google.com/site/theprogramminghistorianja",
-                           "title": "The Programming Historian"
-                        },
-                        {
-                           "url": "http://www.cauldron.sakura.ne.jp/thinkpython/thinkpython/ThinkPython.pdf",
-                           "title": "Think Python：コンピュータサイエンティストのように考えてみよう"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/light",
-                           "title": "お気楽 Python プログラミング入門"
-                        },
-                        {
-                           "url": "http://hdl.handle.net/2433/245698",
-                           "title": "プログラミング演習 Python 2019"
-                        },
-                        {
-                           "url": "https://coreblog.org/ats/stuff/minpy_web",
-                           "title": "みんなのPython Webアプリ編"
-                        },
-                        {
-                           "url": "https://www.kamishima.net/mlmpyja",
-                           "title": "機械学習の Python との出会い (Machine Learning Meets Python)"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Flask",
-                           "entries": [
-                              {
-                                 "url": "https://flask-docs-ja.readthedocs.io/en/latest",
-                                 "title": "Flask ドキュメント"
-                              },
-                              {
-                                 "url": "https://methane.github.io/flask-handson",
-                                 "title": "Flask ハンズオン"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "https://stats.biopapyrus.jp/r",
-                           "title": "R"
-                        },
-                        {
-                           "url": "http://cse.naro.affrc.go.jp/takezawa/r-tips/r2.html",
-                           "title": "R-Tips"
-                        },
-                        {
-                           "url": "https://cran.r-project.org/doc/contrib/manuals-jp/Mase-Rstatman.pdf",
-                           "title": "R 基本統計関数マニュアル"
-                        },
-                        {
-                           "url": "https://cran.r-project.org/doc/contrib/manuals-jp/R-lang.jp.v110.pdf",
-                           "title": "R 言語定義"
-                        },
-                        {
-                           "url": "https://cran.r-project.org/doc/contrib/manuals-jp/R-intro-170.jp.pdf",
-                           "title": "R 入門"
-                        },
-                        {
-                           "url": "http://psycho.edu.yamaguchi-u.ac.jp/wordpress/wp-content/uploads/2014/01/R_tutorial20131.pdf",
-                           "title": "Rチュートリアルセミナーテキスト"
-                        },
-                        {
-                           "url": "https://minato.sip21c.org/statlib/stat.pdf",
-                           "title": "Rによる統計解析の基礎"
-                        },
-                        {
-                           "url": "http://minato.sip21c.org/msb/medstatbook.pdf",
-                           "title": "Rによる保健医療データ解析演習"
-                        },
-                        {
-                           "url": "https://nuss.nagoya-u.ac.jp/index.php/s/kN6ZxsyReNzRPlM",
-                           "title": "統計解析ソフトRのスクリプト集"
-                        },
-                        {
-                           "url": "http://cse.naro.affrc.go.jp/takezawa/r-tips.pdf",
-                           "title": "統計解析フリーソフトRの備忘録"
-                        },
-                        {
-                           "url": "http://blue.zero.jp/yokumura/Rhtml/Haebera2002.html",
-                           "title": "無料統計ソフトRで心理学"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://railsguides.jp",
-                           "title": "Ruby on Rails ガイド"
-                        },
-                        {
-                           "url": "https://railstutorial.jp",
-                           "title": "Ruby on Rails チュートリアル"
-                        },
-                        {
-                           "url": "https://i.loveruby.net/ja/rhg/book",
-                           "title": "Ruby ソースコード完全解説"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/ja/documentation",
-                           "title": "Ruby リファレンスマニュアル"
-                        },
-                        {
-                           "url": "https://route477.net/d/?date=20100125",
-                           "title": "Ruby 基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://yasuhito.github.io/trema-book",
-                           "title": "TremaでOpenFlowプログラミング"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/light/ruby.html",
-                           "title": "お気楽 Ruby プログラミング入門"
-                        },
-                        {
-                           "url": "https://tatsu-zine.com/books/scheme-in-ruby",
-                           "title": "つくって学ぶプログラミング言語 RubyによるScheme処理系の実装"
-                        },
-                        {
-                           "url": "http://www.aoky.net/articles/why_poignant_guide_to_ruby",
-                           "title": "ホワイの(感動的)Rubyガイド"
-                        },
-                        {
-                           "url": "https://www.gentei.org/~yuuji/support/sr/scrp-2020-05.pdf",
-                           "title": "実用的Rubyスクリプティング"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Sather",
-                     "entries": [
-                        {
-                           "url": "https://www.shido.info/sather",
-                           "title": "Sather を試そう"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scala",
-                     "entries": [
-                        {
-                           "url": "https://twitter.github.io/effectivescala/index-ja.html",
-                           "title": "Effective Scala"
-                        },
-                        {
-                           "url": "https://eed3si9n.com/tetrix-in-scala/ja",
-                           "title": "Scala で書く tetrix"
-                        },
-                        {
-                           "url": "https://eed3si9n.com/learning-scalaz/ja",
-                           "title": "独習 Scalaz"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scheme",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20140521224625/http://karetta.jp/book-cover/gauche-hacks",
-                           "title": "Gauche プログラミング(立読み版)"
-                        },
-                        {
-                           "url": "https://practical-scheme.net/gauche/man/gauche-refj.html",
-                           "title": "Gauche ユーザリファレンス"
-                        },
-                        {
-                           "url": "https://ja.wikibooks.org/wiki/Scheme",
-                           "title": "Scheme"
-                        },
-                        {
-                           "url": "https://sites.google.com/site/atponslisp/home/scheme/racket/schemenyuumon-1/schemenyuumon",
-                           "title": "Scheme 入門 スーパービギナー編"
-                        },
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/func/scheme.html",
-                           "title": "お気楽 Scheme プログラミング入門"
-                        },
-                        {
-                           "url": "https://www.shido.info/lisp/idx_scm.html",
-                           "title": "もうひとつの Scheme 入門"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20140812144348/http://www4.ocn.ne.jp/~inukai/scheme_primer_j.html",
-                           "title": "入門Scheme"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "https://kyorohiro.gitbooks.io/doc_scratch",
-                           "title": "炎の型 With Scratch (ゲームプログラム入門)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "sed",
-                     "entries": [
-                        {
-                           "url": "https://www.gcd.org/sengoku/sedlec",
-                           "title": "SED 教室"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Smalltalk",
-                     "entries": [
-                        {
-                           "url": "https://swikis.ddo.jp/squeak/13",
-                           "title": "自由自在 Squeakプログラミング"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL(実装非依存)",
-                     "entries": [
-                        {
-                           "url": "https://www.techscore.com/tech/sql",
-                           "title": "SQL"
-                        },
-                        {
-                           "url": "https://mickindex.sakura.ne.jp/database/WDP/WDP_44.pdf",
-                           "title": "SQLアタマ養成講座"
-                        },
-                        {
-                           "url": "https://mickindex.sakura.ne.jp",
-                           "title": "SQLプログラミング作法"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Standard ML",
-                     "entries": [
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/func/#sml",
-                           "title": "お気楽 Standard ML of New Jersey 入門"
-                        },
-                        {
-                           "url": "https://www.pllab.riec.tohoku.ac.jp/smlsharp/docs/3.0/ja/manual.xhtml",
-                           "title": "プログラミング言語SML#解説"
-                        },
-                        {
-                           "url": "https://www.pllab.riec.tohoku.ac.jp/smlsharp/smlIntroSlidesJP.pdf",
-                           "title": "プログラミング言語Standard ML入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Swift",
-                     "entries": [
-                        {
-                           "url": "http://docs.fabo.io/swift/",
-                           "title": "逆引きSwift"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Tcl/Tk",
-                     "entries": [
-                        {
-                           "url": "http://www.nct9.ne.jp/m_hiroi/tcl_tk.html",
-                           "title": "Tcl/Tk お気楽 GUI プログラミング"
-                        },
-                        {
-                           "url": "http://aoba.cc.saga-u.ac.jp/lecture/TclTk/text.pdf",
-                           "title": "Tcl/Tk入門"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://typescript-jp.gitbook.io/deep-dive/",
-                           "title": "TypeScript Deep Dive 日本語版"
-                        },
-                        {
-                           "url": "https://msakamaki.github.io/clean-code-typescript",
-                           "title": "TypeScriptの為のクリーンコード"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://angular.jp/docs",
-                                 "title": "Angular Docs"
-                              },
-                              {
-                                 "url": "https://angular.jp/tutorial",
-                                 "title": "Angular Tutorial"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "VBA",
-                     "entries": [
-                        {
-                           "url": "https://brain.cc.kogakuin.ac.jp/~kanamaru/lecture/vba2013",
-                           "title": "Excel 2013 で学ぶ Visual Basic for Applications (VBA)"
-                        },
-                        {
-                           "url": "https://nattou-curry-2.hatenadiary.org/entry/20100129/1264787849",
-                           "title": "VBA基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://docs.microsoft.com/ja-jp/office/vba/api/overview/language-reference",
-                           "title": "Visual Basic for Applications (VBA) の言語リファレンス"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Vim",
-                     "entries": [
-                        {
-                           "url": "https://nanasi.jp/code.html",
-                           "title": "Vim スクリプトリファレンス"
-                        },
-                        {
-                           "url": "https://thinca.hatenablog.com/entry/20100201/1265009821",
-                           "title": "Vim スクリプト基礎文法最速マスター"
-                        },
-                        {
-                           "url": "https://vim-jp.org/vimdoc-ja/usr_41.html",
-                           "title": "Vim スクリプト書法"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "ko",
-                  "name": "Korean"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "수학",
-                     "entries": [
-                        {
-                           "url": "https://wstein.org/ent/",
-                           "title": "기초정수론: 계산과 법연산, 그리고 비밀통신을 강조한"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Amazon Web Service",
-                     "entries": [
-                        {
-                           "url": "http://www.pyrasis.com/private/2014/09/30/publish-the-art-of-amazon-web-services-book",
-                           "title": "아마존 웹 서비스를 다루는 기술"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Assembly Language",
-                     "entries": [
-                        {
-                           "url": "http://pacman128.github.io/static/pcasm-book-korean.pdf",
-                           "title": "PC Assembly Language"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://github.com/kev0960/ModooCode/raw/master/book/c/main.pdf",
-                           "title": "씹어먹는 C"
-                        },
-                        {
-                           "url": "https://blogofscience.com/Socket_Programming-KLDP.html",
-                           "title": "BeeJ's Guide to Network Programming - 인터넷 소켓 활용"
-                        },
-                        {
-                           "url": "https://github.com/kev0960/ModooCode/raw/master/book/cpp/main.pdf",
-                           "title": "씹어먹는 C++"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Docker",
-                     "entries": [
-                        {
-                           "url": "http://www.pyrasis.com/private/2014/11/30/publish-docker-for-the-really-impatient-book",
-                           "title": "가장 빨리 만나는 Docker"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "GIT",
-                     "entries": [
-                        {
-                           "url": "https://github.com/tiimgreen/github-cheat-sheet/blob/master/README.ko.md",
-                           "title": "깃허브 치트 시트"
-                        },
-                        {
-                           "url": "http://rogerdudler.github.io/git-guide/index.ko.html",
-                           "title": "Git - 간편 안내서"
-                        },
-                        {
-                           "url": "https://git-scm.com/book/ko/v2",
-                           "title": "Pro Git 한글 번역"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "http://www.pyrasis.com/private/2015/06/01/publish-go-for-the-really-impatient-book",
-                           "title": "가장 빨리 만나는 Go 언어"
-                        },
-                        {
-                           "url": "http://www.codingnuri.com/golang-book/index.html",
-                           "title": "AN INTRODUCTION TO PROGRAMMING IN GO 한글 번역"
-                        },
-                        {
-                           "url": "https://thebook.io/006806/",
-                           "title": "Go 언어 웹 프로그래밍 철저 입문"
-                        },
-                        {
-                           "url": "https://github.com/byounghoonkim/the-little-go-book/",
-                           "title": "The Little Go Book. 리틀 고 책입니다"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML5",
-                     "entries": [
-                        {
-                           "url": "http://fromyou.tistory.com/581",
-                           "title": "HTML5, CSS and JavaScript"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://wikidocs.net/book/31",
-                           "title": "점프 투 자바"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/ko",
-                           "title": "JavaScript Garden"
-                        },
-                        {
-                           "url": "https://helloworldjavascript.net",
-                           "title": "JavaScript로 만나는 세상"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "http://nodejs.sideeffect.kr/docs/",
-                                 "title": "Node.js API 한글 번역 by outsideris"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "https://ctan.org/tex-archive/info/lshort/korean",
-                           "title": "The Not So short Introduction to LaTeX 2ε"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "https://thebook.io/006718/",
-                           "title": "리눅스 서버를 다루는 기술"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "http://qntm.org/files/perl/perl_kr.html",
-                           "title": "2시간 반만에 펄 익히기"
-                        },
-                        {
-                           "url": "https://github.com/aero/perl_docs/blob/master/hatena_perl_oop.md",
-                           "title": "Perl 객체지향프로그래밍(OOP)"
-                        },
-                        {
-                           "url": "http://advent.perl.kr/2014/",
-                           "title": "Seoul.pm 펄 크리스마스 달력 #2014 | Seoul.pm Perl Advent Calendar 2014"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://www.lesstif.com/pages/viewpage.action?pageId=24445740",
-                           "title": "PHP5 의 주요 기능"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Laravel",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/appkr/l5essential",
-                                 "title": "라라벨 (Laravel) 5 입문 및 실전 강좌"
-                              },
-                              {
-                                 "url": "https://www.lesstif.com/display/laravelprog",
-                                 "title": "쉽게 배우는 라라벨 5 프로그래밍"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://wikidocs.net/7839",
-                           "title": "내가 파이썬을 배우는 방법"
-                        },
-                        {
-                           "url": "https://thebook.io/007026",
-                           "title": "모두의 파이썬: 20일 만에 배우는 프로그래밍 기초"
-                        },
-                        {
-                           "url": "https://wikidocs.net/book/2",
-                           "title": "왕초보를 위한 Python 2.7"
-                        },
-                        {
-                           "url": "https://wikidocs.net/book/1",
-                           "title": "점프 투 파이썬 - Python 3"
-                        },
-                        {
-                           "url": "https://python-guide-kr.readthedocs.io/ko/latest/",
-                           "title": "파이썬을 여행하는 히치하이커를 위한 안내서!"
-                        },
-                        {
-                           "url": "https://wikidocs.net/book/1665",
-                           "title": "파이썬을 이용한 비트코인 자동매매"
-                        },
-                        {
-                           "url": "http://byteofpython-korean.sourceforge.net/byte_of_python.pdf",
-                           "title": "A Byte of Python 한글 번역 by Jeongbin Park"
-                        },
-                        {
-                           "url": "https://wikidocs.net/book/2165",
-                           "title": "PyQt5 Tutorial - 파이썬으로 만드는 나만의 GUI 프로그램"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/ko/",
-                                 "title": "장고걸스 튜토리얼 (Django Girls Tutorial)"
-                              },
-                              {
-                                 "url": "https://wikidocs.net/book/4223",
-                                 "title": "점프 투 장고"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Flask",
-                           "entries": [
-                              {
-                                 "url": "https://flask-docs-kr.readthedocs.io/ko/latest/",
-                                 "title": "Flask의 세계에 오신것을 환영합니다."
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://r4pda.co.kr",
-                           "title": "R을 이용한 데이터 처리 & 분석 실무"
-                        },
-                        {
-                           "url": "http://www.openstatistics.net",
-                           "title": "The R Manuals (translated in Korean)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Raspberry Pi",
-                     "entries": [
-                        {
-                           "url": "https://wikidocs.net/book/483",
-                           "title": "라즈베리 파이 문서"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://github.com/dalzony/ruby-style-guide/blob/master/README-koKR.md",
-                           "title": "루비 스타일 가이드"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Rust",
-                     "entries": [
-                        {
-                           "url": "https://rinthel.github.io/rust-lang-book-ko/",
-                           "title": "러스트 프로그래밍 언어"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "http://digital.kyobobook.co.kr/digital/ebook/ebookDetail.ink?barcode=480150000247P",
-                           "title": "창의컴퓨팅(Creative Computing) 가이드북"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "my",
-                  "name": "Burmese"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "<a name=\"golang\">",
-                     "entries": [
-                        {
-                           "url": "https://github.com/nainglinaung/the-little-go-book",
-                           "title": "The Little Go Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML",
-                     "entries": [
-                        {
-                           "url": "https://books.saturngod.net/HTML5/",
-                           "title": "HTML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "http://eimaung.com/ubuntu-for-you",
-                           "title": "Ubuntu Linux for You"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://books.saturngod.net/programming_basic/",
-                           "title": "Programming Basic For Beginner"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Web Development",
-                     "entries": [
-                        {
-                           "url": "http://eimaung.com/professional-web-developer",
-                           "title": "Professional Web Developer"
-                        },
-                        {
-                           "url": "http://eimaung.com/rockstar-developer",
-                           "title": "Rockstar Developer"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "nl",
-                  "name": "Dutch, Flemish"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://nl.wikibooks.org/wiki/Programmeren_in_C",
-                           "title": "Programmeren in C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "https://nl.wikibooks.org/wiki/Programmeren_in_C_Sharp",
-                           "title": "Programmeren in C Sharp"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "COBOL",
-                     "entries": [
-                        {
-                           "url": "https://nl.wikibooks.org/wiki/Programmeren_in_COBOL",
-                           "title": "Programmeren in COBOL"
-                        }
-                     ],
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-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://nl.wikibooks.org/wiki/Programmeren_in_Java",
-                           "title": "Programmeren in Java"
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-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://nl.wikibooks.org/wiki/Programmeren_in_PHP",
-                           "title": "Programmeren in PHP"
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-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/current/the-fast-track/nl/index.html",
-                                 "title": "Symfony 5: Snel van start"
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-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://www.spronck.net/pythonbook/dutchindex.xhtml",
-                           "title": "De Programmeursleerling: Leren coderen met Python 3"
-                        },
-                        {
-                           "url": "https://nl.wikibooks.org/wiki/Programmeren_in_Python",
-                           "title": "Programmeren in Python"
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-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "http://scratched.gse.harvard.edu/resources/creatief-computergebruik",
-                           "title": "Creatief Computergebruik"
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-               "language": {
-                  "code": "no",
-                  "name": "Norwegian"
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-                  "name": "Polish"
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-                     "entries": [
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-                           "url": "https://pl.wikibooks.org/wiki/Git",
-                           "title": "Git"
-                        },
-                        {
-                           "url": "http://apki.org",
-                           "title": "Interaktywna platforma do nauki programowania"
-                        },
-                        {
-                           "url": "https://pl.wikibooks.org/wiki/Pisanie_OS",
-                           "title": "Pisanie OS"
-                        },
-                        {
-                           "url": "http://www.eioba.pl/a/2eu1/poradnik-poczatkujacego-programisty",
-                           "title": "Poradnik początkującego programisty"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/pl/",
-                           "title": "Pro Git"
-                        },
-                        {
-                           "url": "https://www.youtube.com/playlist?list=PLOYHgt8dIdoxOp0wtNk9Sle5WUsBZc6kq",
-                           "title": "Programowanie webowe E14"
-                        },
-                        {
-                           "url": "https://pl.wikibooks.org/wiki/Subversion",
-                           "title": "SVN"
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-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "https://andrzejklusiewicz-android.blogspot.com/p/bezpatny-kurs-programowania-android-java.html",
-                           "title": "O Androidzie ludzkim głosem"
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-                        {
-                           "url": "http://jsystems.pl/storage/kurs_android/ebook/ebook-android.pdf",
-                           "title": "O Androidzie ludzkim głosem"
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-                        {
-                           "url": "http://soldiersofmobile.com/przybornik/przybornik_8_02.pdf",
-                           "title": "Przybornik pragmatycznego programisty Android"
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-                     "section": "Bash",
-                     "entries": [
-                        {
-                           "url": "http://web.archive.org/web/20180129013729/http://dief.republika.pl/kursbasha.tar.gz",
-                           "title": "Kurs Bash'a"
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-                     "entries": [
-                        {
-                           "url": "http://www.asawicki.info/Mirror/Beej_s%20Guide%20to%20Network%20Programming%20PL/bgnet.pdf",
-                           "title": "Beej’s Guide to Network Programming - U˙zywanie gniazd internetowych"
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-                        {
-                           "url": "http://qvazar.pl/kurs-c/kurs-c",
-                           "title": "Kurs C"
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-                        {
-                           "url": "http://kurs-c.manifo.com/konfiguracja-srodowiska-298-547",
-                           "title": "Kurs języka C"
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-                        {
-                           "url": "http://janek.ae.krakow.pl/wiluszt/zajecia/c/ansic/",
-                           "title": "Kurs programowania w języku ANSI C pod systemem UNIX"
-                        },
-                        {
-                           "url": "https://old.opcode.eu.org/programing/c_cpp/",
-                           "title": "Podstawy programowania Unixa/Linuxa"
-                        },
-                        {
-                           "url": "https://upload.wikimedia.org/wikibooks/pl/6/6a/C.pdf",
-                           "title": "Programowanie w C"
-                        },
-                        {
-                           "url": "http://www.arturpyszczuk.pl/files/c/pwc.pdf",
-                           "title": "Programowanie w języku C"
-                        },
-                        {
-                           "url": "http://helion.pl/online/wglab/wglab.zip",
-                           "title": "Wgłąb języka C"
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-                     "section": "C Sharp",
-                     "entries": [
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-                           "url": "http://kurs.aspnetmvc.pl/Csharp",
-                           "title": "Darmowy kurs C#"
-                        },
-                        {
-                           "url": "http://zajacmarek.com/kurs-c-sharp/",
-                           "title": "Kurs C#"
-                        },
-                        {
-                           "url": "https://cezarywalenciuk.pl/blog/programing/kurs/kurs-podstaw-c-sharp",
-                           "title": "Kurs podstawy C#"
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-                        {
-                           "url": "https://4programmers.net/C_sharp",
-                           "title": "Programowanie w języku C#"
-                        },
-                        {
-                           "url": "http://c-sharp.ue.katowice.pl/ksiazka/c_sharp_wer2_0.pdf",
-                           "title": "Wstęp do programowania w C#"
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-                        {
-                           "url": "https://pl.wikibooks.org/wiki/C++",
-                           "title": "C++"
-                        },
-                        {
-                           "url": "http://www.dz5.pl/ti/cpp/zz_dodatki/kurs_cpp_szczegolowy2.pdf",
-                           "title": "Język C++ – podstawy programowania"
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-                        {
-                           "url": "http://cpp0x.pl/kursy/Kurs-C++/1",
-                           "title": "Kurs C++"
-                        },
-                        {
-                           "url": "http://xion.org.pl/productions/texts/coding/megatutorial/",
-                           "title": "Megatutorial \"Od zera do gier kodera\""
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-                           "url": "http://jcubic.pl/lisp_tutorial.php",
-                           "title": "Kurs programowania w języku Common Lisp"
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-                     "entries": [
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-                           "url": "http://www.kurshtml.edu.pl/css/index.html",
-                           "title": "Kaskadowe Arkusze Stylów"
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-                        {
-                           "url": "https://webref.pl/arena/css/css_index.html",
-                           "title": "Kurs CSS"
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-                        {
-                           "url": "https://ferrante.pl/books/html/",
-                           "title": "Moja pierwsza strona internetowa w HTML5 i CSS3"
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-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "https://pl.wikibooks.org/wiki/Haskell",
-                           "title": "Haskell"
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-                     "section": "HTML",
-                     "entries": [
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-                           "url": "http://www.kurshtml.edu.pl/html/zielony.html",
-                           "title": "HTML dla zielonych"
-                        },
-                        {
-                           "url": "http://www.kurshtml.edu.pl",
-                           "title": "KURS HTML"
-                        },
-                        {
-                           "url": "https://ferrante.pl/books/html/",
-                           "title": "Moja pierwsza strona internetowa w HTML5 i CSS3"
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-                     "section": "Java",
-                     "entries": [
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-                           "url": "https://javastart.pl/baza-wiedzy/darmowy-kurs-java",
-                           "title": "Darmowy kurs Java"
-                        },
-                        {
-                           "url": "http://www.dz5.pl/ti/java/java_skladnia.pdf",
-                           "title": "Język Java"
-                        },
-                        {
-                           "url": "https://stormit.pl/kurs-java/",
-                           "title": "Kurs Java"
-                        },
-                        {
-                           "url": "http://www.samouczekprogramisty.pl/kurs-programowania-java/",
-                           "title": "Kurs programowania Java"
-                        },
-                        {
-                           "url": "https://kobietydokodu.pl/kurs-javy/",
-                           "title": "Praktyczny kurs Javy"
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-                     "subsections": []
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-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://pl.wikibooks.org/wiki/JavaScript",
-                           "title": "JavaScript"
-                        },
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/pl",
-                           "title": "JavaScript Garden"
-                        },
-                        {
-                           "url": "http://shebang.pl/kursy/wszystko-jasne/",
-                           "title": "JavaScript. I wszystko jasne"
-                        },
-                        {
-                           "url": "http://www.kurshtml.edu.pl/js/index.html",
-                           "title": "Wstęp - JavaScript"
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-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://www.latex-kurs.x25.pl",
-                           "title": "LaTeX kurs"
-                        },
-                        {
-                           "url": "https://ptm.org.pl/sites/default/files/latex-ksiazka-kucharska.pdf",
-                           "title": "LaTeX. Książka kucharska"
-                        },
-                        {
-                           "url": "http://www.ctan.org/tex-archive/info/lshort/polish",
-                           "title": "Nie za krótkie wprowadzeniedo systemu LATEX 2ε"
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-                     "section": "MySQL",
-                     "entries": [
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-                           "url": "https://miroslawzelent.pl/kurs-mysql/",
-                           "title": "Bazy Danych MYSQL"
-                        },
-                        {
-                           "url": "http://webmade.org/kursy-online/kurs-mysql.php",
-                           "title": "Kurs MySQL"
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-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "http://zajacmarek.com/2014/10/kurs-perl-cz-1/",
-                           "title": "Kurs Perl"
-                        },
-                        {
-                           "url": "cyberpunk.e-spin.pl/86,41,5/KOD/KURSY-PROGRAMOWANIA/Kurs-PERL",
-                           "title": "Kurs PERL"
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-                        {
-                           "url": "https://pl.wikibooks.org/wiki/Perl",
-                           "title": "Perl"
-                        },
-                        {
-                           "url": "https://www.w3big.com/pl/perl/default.html",
-                           "title": "Samouczek Perl"
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-                     "section": "PHP",
-                     "entries": [
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-                           "url": "http://phpkurs.pl",
-                           "title": "Kurs PHP"
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-                        {
-                           "url": "http://cyberpunk.e-spin.pl/86,37,5/KOD/KURSY-PROGRAMOWANIA/Kurs-PHP-OOP",
-                           "title": "Kurs PHP OOP"
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-                        {
-                           "url": "https://pl.wikibooks.org/wiki/PHP",
-                           "title": "PHP"
-                        },
-                        {
-                           "url": "http://pl.phptherightway.com",
-                           "title": "PHP: The Right Way"
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-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/pl/index.html",
-                                 "title": "Symfony 5: Szybki start"
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-                     "section": "Prolog",
-                     "entries": [
-                        {
-                           "url": "http://www.pwlzo.pl",
-                           "title": "Programowanie w logice z ograniczeniami: Łagodne wprowadzenie dla platformy ECLiPSe"
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-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://www.python.rk.edu.pl",
-                           "title": "Biblioteka Pythona"
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-                        {
-                           "url": "http://www.python.rk.edu.pl/w/p/podstawy/",
-                           "title": "Podstawy Pythona"
-                        },
-                        {
-                           "url": "https://py4e.pl/book",
-                           "title": "Python dla wszystkich: Odkrywanie danych z Python 3"
-                        },
-                        {
-                           "url": "https://pl.wikibooks.org/wiki/Zanurkuj_w_Pythonie",
-                           "title": "Zanurkuj w Pythonie"
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-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "http://www.python.rk.edu.pl/w/p/djangoindex/",
-                                 "title": "Kurs Django"
-                              },
-                              {
-                                 "url": "https://tutorial.djangogirls.org/pl/",
-                                 "title": "Kurs Django Girls"
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-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://pl.wikibooks.org/wiki/Ruby",
-                           "title": "Ruby"
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-                     "section": "SQL",
-                     "entries": [
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-                           "url": "https://www.sqlpedia.pl/kurs-sql",
-                           "title": "Kurs SQL"
-                        },
-                        {
-                           "url": "http://andrzejklusiewicz.blogspot.com/2010/11/kurs-oracle-plsql.html",
-                           "title": "PL/SQL - podstawy (na stronie)"
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-                        {
-                           "url": "http://andrzejklusiewicz.blogspot.com/2010/11/kurs-oracle-sql.html",
-                           "title": "SQL - podstawy (na stronie)"
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-                     "subsections": []
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-               "language": {
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-                  "name": "Portuguese (Brazil)"
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-                     "section": "Agnósticos",
-                     "entries": [],
-                     "subsections": [
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-                           "section": "IDE / Editores",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/bylearn/VS-Code-Produtividade-Infinita",
-                                 "title": "Visual Studio Code: Produtividade infinita"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Vim",
-                           "entries": [
-                              {
-                                 "url": "https://code.google.com/p/vimbook",
-                                 "title": "O Editor de Texto Vim"
-                              },
-                              {
-                                 "url": "https://woliveiras.com.br/vimparanoobs/",
-                                 "title": "Vim para Noobs"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Programação",
-                           "entries": [
-                              {
-                                 "url": "http://www.ferrari.pro.br/home/documents/FFerrari-CCechinel-Introducao-a-algoritmos.pdf",
-                                 "title": "Introdução a Algoritmos e Programação"
-                              },
-                              {
-                                 "url": "https://dicasdeprogramacao.com.br/download/ebook-logica-de-programacao-para-iniciantes.pdf",
-                                 "title": "Lógica de Programação para iniciantes"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Sistemas Operacionais",
-                           "entries": [
-                              {
-                                 "url": "https://www.guiafoca.org/#download",
-                                 "title": "Guia Foca Linux"
-                              },
-                              {
-                                 "url": "http://wiki.inf.ufpr.br/maziero/lib/exe/fetch.php?media=socm:socm-livro.pdf",
-                                 "title": "Sistemas Operacionais: Conceitos e Mecanismos"
-                              }
-                           ]
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-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/google-android",
-                           "title": "Google Android: Uma abordagem prática e didática"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Assembly",
-                     "entries": [
-                        {
-                           "url": "https://mentebinaria.gitbook.io/assembly-x86/",
-                           "title": "Assembly x86"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://www.ime.usp.br/~slago/slago-C.pdf",
-                           "title": "Apostila Linguagem C"
-                        },
-                        {
-                           "url": "http://www2.dcc.ufmg.br/disciplinas/pc/source/introducao_c_renatocm_deeufmg.pdf",
-                           "title": "Curso de Programação em C - UFMG"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bgnet/translations/bgnet_ptbr.html",
-                           "title": "Guia Beej's Para Programação em Rede - Usando Internet Sockets"
-                        },
-                        {
-                           "url": "https://github.com/ufpb-computacao/introducao-a-programacao-livro/releases",
-                           "title": "Introdução a Programação"
-                        },
-                        {
-                           "url": "http://www.ime.usp.br/~elo/IntroducaoComputacao/",
-                           "title": "Introdução em Computação - C"
-                        },
-                        {
-                           "url": "https://fiorix.files.wordpress.com/2014/04/o-fantc3a1stico-mundo-da-linguagem-c.pdf",
-                           "title": "O Fantástico Mundo da Linguagem C"
-                        },
-                        {
-                           "url": "http://www.ime.usp.br/~pf/algoritmos/",
-                           "title": "Projeto de Algoritmos em C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "https://www.caelum.com.br/apostila-csharp-orientacao-objetos/",
-                           "title": "C# e Orientação a Objetos"
-                        },
-                        {
-                           "url": "http://www.ime.usp.br/~slago/slago-C++.pdf",
-                           "title": "Apostila Linguagem C++"
-                        },
-                        {
-                           "url": "http://calhau.dca.fee.unicamp.br/wiki/images/0/01/EstruturasDados.pdf",
-                           "title": "Estrutura de Dados"
-                        },
-                        {
-                           "url": "http://webserver2.tecgraf.puc-rio.br/~manuel/Download/Programacao%20Orientada%20a%20Objetos%20em%20C++.pdf",
-                           "title": "Programação Orientada a Objetos em C++"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Docker",
-                     "entries": [
-                        {
-                           "url": "https://livro.descomplicandodocker.com.br",
-                           "title": "Descomplicando o Docker"
-                        },
-                        {
-                           "url": "https://leanpub.com/dockerparadesenvolvedores",
-                           "title": "Docker para desenvolvedores"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Engenharia de Software",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Metodologias de Desenvolvimento de Software",
-                           "entries": [
-                              {
-                                 "url": "http://www.infoq.com/br/minibooks/kanban-scrum-minibook",
-                                 "title": "Kanban e Scrum - obtendo o melhor de ambos"
-                              },
-                              {
-                                 "url": "http://www.infoq.com/br/minibooks/priming-kanban-jesper-boeg",
-                                 "title": "Kanban em 10 Passos"
-                              },
-                              {
-                                 "url": "http://www.infoq.com/br/minibooks/scrum-xp-from-the-trenches",
-                                 "title": "Scrum e XP direto das Trincheiras"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Arquitetura de Software",
-                           "entries": [
-                              {
-                                 "url": "https://docs.microsoft.com/pt-br/dotnet/architecture/modern-web-apps-azure/",
-                                 "title": "ASP.NET Core architecture"
-                              },
-                              {
-                                 "url": "https://docs.microsoft.com/pt-br/dotnet/architecture/microservices/",
-                                 "title": "Microservices architecture"
-                              },
-                              {
-                                 "url": "https://docs.microsoft.com/pt-br/dotnet/architecture/modernize-with-azure-containers/",
-                                 "title": "Modernizing existing .NET apps"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Outros",
-                           "entries": [
-                              {
-                                 "url": "https://ci.mrprompt.com.br",
-                                 "title": "CI - Integração Contínua Sem Desculpa"
-                              },
-                              {
-                                 "url": "https://leanpub.com/deployemprodparadevs",
-                                 "title": "Deploy em produção para desenvolvedores"
-                              },
-                              {
-                                 "url": "https://engsoftmoderna.info",
-                                 "title": "Engenharia de Software Moderna"
-                              },
-                              {
-                                 "url": "https://leanpub.com/primeiros-passos-com-padroes-de-projeto/",
-                                 "title": "Primeiros passos com Padrões de Projeto"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Fundamentos Matemáticos Computacionais",
-                     "entries": [
-                        {
-                           "url": "https://www.tsouanas.org/fmcbook/",
-                           "title": "Matemática Fundacional para Computação - Em progresso"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "http://rogerdudler.github.io/git-guide/index.pt_BR.html",
-                           "title": "Git - guia prático"
-                        },
-                        {
-                           "url": "http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/pt_br/",
-                           "title": "Git Magic"
-                        },
-                        {
-                           "url": "https://github.com/ltiaunesp/Git-Minicurso",
-                           "title": "Minicurso - Controle de Versão usando o Git"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/pt-br/",
-                           "title": "Pro Git"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "GO",
-                     "entries": [
-                        {
-                           "url": "https://larien.gitbook.io/aprenda-go-com-testes",
-                           "title": "Aprenda Go com Testes"
-                        },
-                        {
-                           "url": "https://github.com/go-br/estudos",
-                           "title": "Go - hands on"
-                        },
-                        {
-                           "url": "http://goporexemplo.golangbr.org",
-                           "title": "Go por Exemplo"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "https://github.com/taylorrf/learnhaskell",
-                           "title": "Aprender o Haskell será um grande bem para você (tradução em andamento)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML / CSS",
-                     "entries": [
-                        {
-                           "url": "https://www.telecom.uff.br/pet/petws/downloads/apostilas/HTML.pdf",
-                           "title": "Apostila de HTML"
-                        },
-                        {
-                           "url": "https://www.caelum.com.br/apostila-html-css-javascript/",
-                           "title": "Desenvolvimento Web com HTML, CSS e JavaScript"
-                        },
-                        {
-                           "url": "http://diveintohtml5.com.br",
-                           "title": "Dive Into HTML5"
-                        },
-                        {
-                           "url": "http://pt-br.learnlayout.com",
-                           "title": "Estruturando o HTML com CSS"
-                        },
-                        {
-                           "url": "https://leanpub.com/warau",
-                           "title": "Websites Atendendo a Requisitos de Acessibilidade e Usabilidade"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/rafaelsakurai/desenvolvimento-distribuido",
-                           "title": "Desenvolvimento Distribuído com JavaEE"
-                        },
-                        {
-                           "url": "https://leanpub.com/imergindo-jvm",
-                           "title": "Imergindo na JVM"
-                        },
-                        {
-                           "url": "http://ccsl.ime.usp.br/files/publications/files/2008/intro-java-cc.pdf",
-                           "title": "Introdução a Ciência da Computação com Java"
-                        },
-                        {
-                           "url": "http://www.caelum.com.br/apostila-java-orientacao-objetos/",
-                           "title": "Java e Orientação a Objetos"
-                        },
-                        {
-                           "url": "http://www.caelum.com.br/apostila-java-web/",
-                           "title": "Java para Desenvolvimento Web"
-                        },
-                        {
-                           "url": "https://s3.amazonaws.com/algaworks-assets/ebooks/algaworks-livro-programacao-para-iniciantes-v1.1.pdf",
-                           "title": "Programação para iniciantes"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://github.com/braziljs/eloquente-javascript",
-                           "title": "Eloquente JavaScript"
-                        },
-                        {
-                           "url": "http://stack.desenvolvedor.expert",
-                           "title": "EXPERT JS Stack"
-                        },
-                        {
-                           "url": "https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Guide",
-                           "title": "Guia JavaScript"
-                        },
-                        {
-                           "url": "https://leanpub.com/guiarapidofirefoxos",
-                           "title": "Guia Rápido de Desenvolvimento para Firefox OS"
-                        },
-                        {
-                           "url": "http://jstherightway.org/pt-br/",
-                           "title": "JS: A forma certa"
-                        },
-                        {
-                           "url": "https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/async%20&%20performance/README.md",
-                           "title": "You Don't Know JS: Async & Performance"
-                        },
-                        {
-                           "url": "https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/es6%20&%20beyond/README.md",
-                           "title": "You Don't Know JS: ES6 & Além"
-                        },
-                        {
-                           "url": "https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/scope%20&%20closures/README.md",
-                           "title": "You Don't Know JS: Escopos & Closures"
-                        },
-                        {
-                           "url": "https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/up%20&%20going/README.md",
-                           "title": "You Don't Know JS: Iniciando"
-                        },
-                        {
-                           "url": "https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/this%20&%20object%20prototypes/README.md",
-                           "title": "You Don't Know JS: this & Prototipagem de Objetos"
-                        },
-                        {
-                           "url": "https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/types%20&%20grammar/README.md",
-                           "title": "You Don't Know JS: Tipos & Gramática"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "http://tableless.com.br/criando-uma-aplicacao-simples-com-angularjs/",
-                                 "title": "Criando uma aplicação simples com AngularJS"
-                              },
-                              {
-                                 "url": "http://tableless.com.br/criando-uma-aplicacao-single-page-com-angularjs/",
-                                 "title": "Criando uma aplicação Single Page com AngularJS"
-                              },
-                              {
-                                 "url": "http://tableless.com.br/diretivas-angularjs-abas/",
-                                 "title": "Entendendo as diretivas e fazendo abas com AngularJS"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Backbone.js",
-                           "entries": [
-                              {
-                                 "url": "http://blog.fernandomantoan.com/serie-backbone-js-parte-1-introducao/",
-                                 "title": "Série Backbone.js (blog.fernandomantoan.com)"
-                              },
-                              {
-                                 "url": "http://www.devfuria.com.br/javascript/backbone/",
-                                 "title": "Série Backbone.js (devfuria.com.br)"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Ember.js",
-                           "entries": [
-                              {
-                                 "url": "http://fabriciotav.org/blog/2013/02/20/conceitos-basicos-do-emberjs.html",
-                                 "title": "Conceitos basicos do Ember.js"
-                              },
-                              {
-                                 "url": "http://fabriciotav.org/blog/2013/02/20/handlebars-helpers-com-emberjs.html",
-                                 "title": "Handlebars Helpers com Ember.js"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Express.js",
-                           "entries": [
-                              {
-                                 "url": "http://nodebr.com/primeiros-passos-com-express-em-node-js/",
-                                 "title": "Primeiros passos com Express em Node.js"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Grunt",
-                           "entries": [
-                              {
-                                 "url": "http://tableless.com.br/grunt-voce-deveria-estar-usando/",
-                                 "title": "Grunt - Voce deveria estar usando"
-                              },
-                              {
-                                 "url": "http://woliveiras.com.br/posts/grunt-automatizando-tarefas/",
-                                 "title": "Grunt | Automatizando tarefas"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Gulp",
-                           "entries": [
-                              {
-                                 "url": "http://tableless.com.br/gulp-o-novo-automatizador/",
-                                 "title": "Gulp - O novo automatizador"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "jQuery",
-                           "entries": [
-                              {
-                                 "url": "https://tableless.com.br/categories/jquery/",
-                                 "title": "Artigos sobre jQuery"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Knockout.js",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/alexhiroshi/knockoutjs-brasil",
-                                 "title": "Documentação"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Meteor",
-                           "entries": [
-                              {
-                                 "url": "http://udgwebdev.com/meteor/",
-                                 "title": "Tudo sobre Meteor"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/caio-ribeiro-pereira/livro-nodejs",
-                                 "title": "Aplicações web real-time com Node.js"
-                              },
-                              {
-                                 "url": "https://leanpub.com/construindo-apis-testaveis-com-nodejs/",
-                                 "title": "Construindo APIs testáveis com Node.js"
-                              },
-                              {
-                                 "url": "http://udgwebdev.com/nodejs/",
-                                 "title": "Node.js para Leigos"
-                              },
-                              {
-                                 "url": "http://tableless.com.br/raspagem-de-dados-com-node-js/",
-                                 "title": "Raspagem de dados com Node.js"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React",
-                           "entries": [
-                              {
-                                 "url": "http://tableless.com.br/react-javascript-reativo/",
-                                 "title": "React: JavaScript reativo"
-                              },
-                              {
-                                 "url": "https://leanpub.com/the-road-to-learn-react-portuguese",
-                                 "title": "The Road to Learn React"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Vue.js",
-                           "entries": [
-                              {
-                                 "url": "https://web.archive.org/web/20180613054310/http://www.vedovelli.com.br/frontend/adicionar-bootstrap-e-font-awesome-no-projeto-criado-com-o-vue-cli/",
-                                 "title": "Adicionar Bootstrap e Font-awesome no projeto criado com o Vue Cli"
-                              },
-                              {
-                                 "url": "https://br.vuejs.org/v2/guide/",
-                                 "title": "Documentação pt-BR"
-                              },
-                              {
-                                 "url": "http://www.vuejs-brasil.com.br",
-                                 "title": "Vue.js Brasil - Artigos em Português sobre Vue.js"
-                              },
-                              {
-                                 "url": "https://leanpub.com/livro-vue",
-                                 "title": "Vue.js na prática"
-                              },
-                              {
-                                 "url": "http://web.archive.org/web/20160331162636/http://carlosgartner.com.br/vuejs-filtro-para-criar-urls-amigaveis/",
-                                 "title": "VueJS: Filtro para criar URL’s amigáveis"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Kubernetes",
-                     "entries": [
-                        {
-                           "url": "https://livro.descomplicandokubernetes.com.br",
-                           "title": "Descomplicando Kubernetes"
-                        },
-                        {
-                           "url": "https://docs.microsoft.com/pt-br/learn/paths/intro-to-kubernetes-on-azure/",
-                           "title": "Introdução ao Kubernetes no Azure"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://www.if.ufrj.br/~sandra/MetComp/doc/latex.pdf",
-                           "title": "Breve Introdução ao LaTeX2e"
-                        },
-                        {
-                           "url": "http://ctan.org/pkg/lshort-portuguese-br",
-                           "title": "Introdução ao LaTeX 2 - Ou LaTeX 2 em 105 minutos"
-                        },
-                        {
-                           "url": "https://www.ime.usp.br/~tassio/arquivo/latex/apostila.pdf",
-                           "title": "Latexação"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LISP",
-                     "entries": [
-                        {
-                           "url": "http://www.dca.fee.unicamp.br/courses/EA072/lisp9596/Lisp9596.html",
-                           "title": "Introdução a linguagem LISP"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lua",
-                     "entries": [
-                        {
-                           "url": "http://www.lua.org/manual/5.2/pt/",
-                           "title": "Manual de Referência de Lua 5.2"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://asemanaphp.com.br",
-                           "title": "A semana PHP"
-                        },
-                        {
-                           "url": "http://bit.ly/ebook-silex",
-                           "title": "Api REST Com Silex no GAE"
-                        },
-                        {
-                           "url": "http://book.cakephp.org/2.0/pt/index.html",
-                           "title": "CakePHP"
-                        },
-                        {
-                           "url": "http://www.etelg.com.br/paginaete/downloads/informatica/php.pdf",
-                           "title": "Curso Linguagem PHP 2000"
-                        },
-                        {
-                           "url": "http://br.phptherightway.com",
-                           "title": "PHP Do jeito certo"
-                        },
-                        {
-                           "url": "https://phpunit.de/manual/current/pt_br/index.html",
-                           "title": "PHPUnit"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/pt_BR/index.html",
-                                 "title": "Symfony 5: A Trilha Rápida"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://aprendendo-computacao-com-python.readthedocs.org/en/latest/index.html",
-                           "title": "Aprenda computação com Python"
-                        },
-                        {
-                           "url": "http://felipegalvao.com.br/livros",
-                           "title": "Aprenda Python Básico - Rápido e Fácil de entender"
-                        },
-                        {
-                           "url": "https://osantana.me/curso-de-python-e-django",
-                           "title": "Curso de Python e Django"
-                        },
-                        {
-                           "url": "http://turing.com.br/material/acpython/mod3/django/index.html",
-                           "title": "Django 101 - Introdução ao Django"
-                        },
-                        {
-                           "url": "http://professor.luzerna.ifc.edu.br/ricardo-antonello/wp-content/uploads/sites/8/2017/02/Livro-Introdu%C3%A7%C3%A3o-a-Vis%C3%A3o-Computacional-com-Python-e-OpenCV-3.pdf",
-                           "title": "Introdução a Visão Computacional com Python e OpenCV"
-                        },
-                        {
-                           "url": "https://python-guide-pt-br.readthedocs.io/pt_BR/latest/",
-                           "title": "O Guia do Mochileiro para Python!"
-                        },
-                        {
-                           "url": "http://turing.com.br/pydoc/2.7/tutorial/",
-                           "title": "O tutorial de Python"
-                        },
-                        {
-                           "url": "https://penseallen.github.io/PensePython2e",
-                           "title": "Pense em Python"
-                        },
-                        {
-                           "url": "https://www.caelum.com.br/apostila-python-orientacao-a-objetos/",
-                           "title": "Python e Orientação a Objetos"
-                        },
-                        {
-                           "url": "https://dunossauro.github.io/python-funcional/",
-                           "title": "Python Funcional"
-                        },
-                        {
-                           "url": "https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxyYWZhZWx1ZnR8Z3g6NTJlM2UzYzY1ZTgzMDEwMw",
-                           "title": "Python Orientado a Objetos"
-                        },
-                        {
-                           "url": "https://ark4n.files.wordpress.com/2010/01/python_para_desenvolvedores_2ed.pdf",
-                           "title": "Python para Desenvolvedores"
-                        },
-                        {
-                           "url": "http://tutorial.djangogirls.org/pt/",
-                           "title": "Tutorial Django Girls"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://pythonacademy.com.br/ebooks/desenvolvimento-web-com-python-e-django",
-                                 "title": "Desenvolvimento Web com Python e Django"
-                              },
-                              {
-                                 "url": "https://docs.djangoproject.com/pt-br",
-                                 "title": "Documentação do Django"
-                              },
-                              {
-                                 "url": "https://tutorial.djangogirls.org/pt/",
-                                 "title": "Tutorial Django Girls"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://www.uesc.br/editora/livrosdigitais2/analiseexploratoria_r.pdf",
-                           "title": "Análise Exploratória de Dados usando o R"
-                        },
-                        {
-                           "url": "https://www.ibpad.com.br/o-que-fazemos/publicacoes/introducao-ciencia-de-dados-com-r/",
-                           "title": "Ciência de Dados com R"
-                        },
-                        {
-                           "url": "https://homepages.dcc.ufmg.br/~assuncao/EstatCC/FECD.pdf",
-                           "title": "Fundamentos Estatísticos de Ciência dos Dados"
-                        },
-                        {
-                           "url": "http://www.uesc.br/editora/livrosdigitais_20140513/r_cientistas.pdf",
-                           "title": "R para cientistas sociais"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "RegEx",
-                     "entries": [
-                        {
-                           "url": "http://aurelio.net/regex/guia/",
-                           "title": "Expressões Regulares - Guia de Consulta Rápida"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "http://www.jmonteiro.com/aprendaaprogramar/",
-                           "title": "Aprenda a Programar"
-                        },
-                        {
-                           "url": "https://leanpub.com/conhecendo-ruby/read",
-                           "title": "Conhecendo Ruby - Eustaquio Rangel"
-                        },
-                        {
-                           "url": "http://why.carlosbrando.com",
-                           "title": "O (comovente) guia de Ruby do Why"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Shell",
-                     "entries": [
-                        {
-                           "url": "http://aurelio.net/shell/apostila-introducao-shell.pdf",
-                           "title": "Introdução ao Shell Script"
-                        },
-                        {
-                           "url": "https://www.telecom.uff.br/pet/petws/downloads/apostilas/LINUX.pdf",
-                           "title": "Pequena introdução ao linux e ao Shell Script"
-                        },
-                        {
-                           "url": "http://metamorphoselinux.net/Shell_Script_do_Zero.pdf",
-                           "title": "Shell Script do Zero"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://www.maiconsilva.com/starting-typescript/",
-                           "title": "Iniciando no TypeScript - Guia prático para os primeiros passos da linguagem"
-                        },
-                        {
-                           "url": "https://www.typescriptlang.org/pt/docs/",
-                           "title": "TypeScript Documentação"
-                        },
-                        {
-                           "url": "https://oieduardorabelo.medium.com/typescript-o-guia-definitivo-1a63b04259cc",
-                           "title": "TypeScript: O guia definitivo"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "http://www.macoratti.net/17/02/net_ang2vsc1.htm",
-                                 "title": "Angular 2 - Criando sua primeira aplicação no Visual Studio Code"
-                              },
-                              {
-                                 "url": "https://www.ibm.com/developerworks/br/library/implemente-aplicativo-pagina-unica-angular-2/",
-                                 "title": "Implemente um aplicativo de página única com o Angular 2"
-                              }
-                           ]
-                        }
-                     ]
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "pt-PT",
-                  "name": "Portuguese (Portugal)"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "C/C++",
-                     "entries": [
-                        {
-                           "url": "http://www.dei.isep.ipp.pt/~pbsousa/aulas/ano_0/2006_07/c/Sebenta-cpp-03-2006.pdf",
-                           "title": "Apontamentos de Programação em C/C++"
-                        },
-                        {
-                           "url": "https://henriquedias.com/downloads/aprenda_a_programar.pdf",
-                           "title": "Aprenda a Programar - Uma Breve Introdução (2015)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CSS",
-                     "entries": [
-                        {
-                           "url": "http://pt-pt.learnlayout.com",
-                           "title": "Aprenda o layout de CSS"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "http://www4.di.uminho.pt/~mjf/pub/PF-Haskell.pdf",
-                           "title": "Programação Funcional CC"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://alfarrabio.di.uminho.pt/~albie/lshort/pt-lshort.pdf",
-                           "title": "Uma não tão pequena introdução ao LaTeX"
-                        },
-                        {
-                           "url": "http://www.ctan.org/tex-archive/info/lshort/portuguese",
-                           "title": "Uma não tão pequena introdução ao LATEX 2ε"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Prolog",
-                     "entries": [
-                        {
-                           "url": "http://www4.di.uminho.pt/~mjf/pub/LC-Prolog.pdf",
-                           "title": "Lógica Computacional (com Prolog)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://do1.dr-chuck.com/pythonlearn/PT_br/pythonlearn.pdf",
-                           "title": "Python Para Todos: Explorando Dados com Python 3"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "ro",
-                  "name": "Moldovan, Moldavian, Romanian"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "Ajax",
-                     "entries": [
-                        {
-                           "url": "http://etutoriale.ro/articles/1483/1/Tutorial-Ajax/",
-                           "title": "Ajax"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML",
-                     "entries": [
-                        {
-                           "url": "http://tutorialehtml.com/ro/introducere-in-html/",
-                           "title": "HTML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "http://profs.info.uaic.ro/~busaco/teach/courses/net/docs/mysql-ro.pdf",
-                           "title": "MySQL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://php.punctsivirgula.ro",
-                           "title": "PHP"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/current/the-fast-track/ro/index.html",
-                                 "title": "Symfony 5: Curs rapid"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "http://scratched.gse.harvard.edu/resources/informatica-creativa-0",
-                           "title": "Informatica Creativa"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "ru",
-                  "name": "Russian"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "0 - Language Agnostic",
-                     "entries": [
-                        {
-                           "url": "https://younglinux.info/blender.php",
-                           "title": "3D-моделирование в Blender"
-                        },
-                        {
-                           "url": "https://mkurnosov.net/docs/dsa-book-2020.pdf",
-                           "title": "Введение в методы машинной обработки данных"
-                        },
-                        {
-                           "url": "http://padabum.com/x.php?id=35055",
-                           "title": "Занимательное программирование. Самоучитель"
-                        },
-                        {
-                           "url": "https://vseloved.github.io/pdf/os-ru.pdf",
-                           "title": "Операционные системы"
-                        },
-                        {
-                           "url": "http://www.inp.nsk.su/~baldin/Parallel/index.html",
-                           "title": "Параллельные технологии"
-                        },
-                        {
-                           "url": "http://stolyarov.info/books/programming_intro",
-                           "title": "Программирование: введение в профессию"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/http-tutorial",
-                           "title": "Руководство по HTTP"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/soap-tutorial",
-                           "title": "Руководство по SOAP"
-                        },
-                        {
-                           "url": "http://newstar.rinet.ru/~goga/sicp/sicp-ru-screen.pdf",
-                           "title": "Структура и интерпретация компьютерных программ"
-                        },
-                        {
-                           "url": "http://svyatoslav.biz/software_testing_book/",
-                           "title": "Тестирование программного обеспечения. Базовый курс."
-                        },
-                        {
-                           "url": "http://discopal.ispras.ru/Ru.book-advanced-algorithms.htm",
-                           "title": "Эффективные алгоритмы и сложность вычислений"
-                        },
-                        {
-                           "url": "http://e-maxx.ru/upload/e-maxx_algo.pdf",
-                           "title": "E-maxx.ru: Сборник алгоритмов с примерами на C++"
-                        },
-                        {
-                           "url": "http://scrum.org.ua/wp-content/uploads/2008/12/scrum_xp-from-the-trenches-rus-final.pdf",
-                           "title": "Scrum и XP: заметки с передовой"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Облачные вычисления",
-                           "entries": [
-                              {
-                                 "url": "http://www.microsoft.com/ru-ru/download/details.aspx?id=29263",
-                                 "title": "Разработка мультитенантных приложений для облака, издание 3-е"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Парадигмы программирования",
-                           "entries": [
-                              {
-                                 "url": "http://funprog-ru.github.io",
-                                 "title": "Введение в функциональное программирование"
-                              },
-                              {
-                                 "url": "http://fprog.ru",
-                                 "title": "Практика функционального программирования"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Работа с сетью",
-                           "entries": [
-                              {
-                                 "url": "http://networksciencebook.com",
-                                 "title": "Наука о Сетях"
-                              },
-                              {
-                                 "url": "https://github.com/vlet/http2-explained/blob/master/http2.ru.pdf?raw=true",
-                                 "title": "Разъяснение HTTP2"
-                              },
-                              {
-                                 "url": "https://sites.google.com/site/yartikhiy/home/ipv6book",
-                                 "title": "IPv6 для знатоков IPv4"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Управление конфигурациями",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/freetonik/ansible-tuto-rus",
-                                 "title": "Пособие по Ansible"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Open Source Ecosystem",
-                           "entries": [
-                              {
-                                 "url": "http://rus-linux.net/MyLDP/BOOKS/Architecture-Open-Source-Applications/index.html",
-                                 "title": "Архитектура приложений с открытым исходным кодом"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Assembly",
-                     "entries": [
-                        {
-                           "url": "https://ru.wikibooks.org/wiki/Ассемблер_в_Linux_для_программистов_C",
-                           "title": "Ассемблер в Linux для программистов C"
-                        },
-                        {
-                           "url": "http://av-assembler.ru/asm/afd/assembler-for-dummy.htm",
-                           "title": "Ассемблер для чайников"
-                        },
-                        {
-                           "url": "http://www.mcst.ru/doc/book_121130.pdf",
-                           "title": "Микропроцессоры и вычислительные комплексы семейства \"Эльбрус\""
-                        },
-                        {
-                           "url": "http://www.stolyarov.info/books/pdf/nasm_unix.pdf",
-                           "title": "Программирование на языке ассемблера NASM для ОС Unix"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Bash",
-                     "entries": [
-                        {
-                           "url": "http://rus-linux.net/MyLDP/BOOKS/abs-guide/flat/abs-book.html",
-                           "title": "Advanced Bash-Scripting Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://yurichev.com/writings/C-notes-ru.pdf",
-                           "title": "Заметки о языке программирования Си/Си++"
-                        },
-                        {
-                           "url": "https://paintingvalley.com/ru-bggdb",
-                           "title": "Краткое руководство Beej к GDB"
-                        },
-                        {
-                           "url": "https://younglinux.info/c",
-                           "title": "Особенности языка C. Учебное пособие"
-                        },
-                        {
-                           "url": "http://zed.karelia.ru/mmedia/docs/nets.pdf",
-                           "title": "Разработка сетевых приложений"
-                        },
-                        {
-                           "url": "https://metanit.com/cpp/c",
-                           "title": "Руководство по языку программирования C"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bgnet/translations/bgnet_A4_rus.pdf",
-                           "title": "Сетевое программирование от Биджа - Использование Интернет Сокетов"
-                        },
-                        {
-                           "url": "http://ermak.cs.nstu.ru/cprog/html",
-                           "title": "Си/Си++. От дилетанта до профессионала"
-                        },
-                        {
-                           "url": "https://ru.wikibooks.org/wiki/Язык_Си_в_примерах",
-                           "title": "Язык Си в примерах"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "https://metanit.com/sharp/patterns",
-                           "title": "Паттерны проектирования в C# и .NET"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/tutorial",
-                           "title": "Полное руководство по языку программирования С# 7.0 и платформе .NET 4.7"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/net",
-                           "title": "Сетевое программирование в С# и .NET"
-                        },
-                        {
-                           "url": "http://itvdn.com/ru/patterns",
-                           "title": "Design Patterns via C#"
-                        },
-                        {
-                           "url": "http://lib.ru/CPPHB/cpptut.txt_with-big-pictures.html",
-                           "title": "Введение в язык программирования С++"
-                        },
-                        {
-                           "url": "http://stolyarov.info/books/cppintro",
-                           "title": "Введение в язык Си++"
-                        },
-                        {
-                           "url": "http://ru.wikibooks.org/wiki/Си-плюс-плюс",
-                           "title": "Вводный курс по объектно-ориентированному программированию на языке Си++"
-                        },
-                        {
-                           "url": "https://metanit.com/cpp/tutorial",
-                           "title": "Руководство по языку программирования C++"
-                        },
-                        {
-                           "url": "http://lib.ru/CPPHB/cppref.txt_with-big-pictures.html",
-                           "title": "Справочное руководство по C++"
-                        },
-                        {
-                           "url": "https://code.google.com/archive/p/gl33lessons/",
-                           "title": "Уроки по OpenGL 3"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Clojure",
-                     "entries": [
-                        {
-                           "url": "http://alexott.net/ru/clojure/clojure-intro",
-                           "title": "Введение в Clojure"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CoffeeScript",
-                     "entries": [
-                        {
-                           "url": "http://cidocs.ru/coffeescript",
-                           "title": "Документация CoffeeScript"
-                        },
-                        {
-                           "url": "https://github.com/andrew--r/the-little-book-on-coffeescript",
-                           "title": "The Little Book on CoffeeScript"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Elasticsearch",
-                     "entries": [
-                        {
-                           "url": "https://codedzen.ru/category/uroki/elasticsearch",
-                           "title": "Уроки по Elasticsearch"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Elixir",
-                     "entries": [
-                        {
-                           "url": "http://elixirschool.com/ru",
-                           "title": "Уроки программирования на языке Elixir"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Erlang",
-                     "entries": [
-                        {
-                           "url": "https://github.com/dyp2000/Russian-Armstrong-Erlang",
-                           "title": "Программирование на Эрланге"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "http://www-cs-students.stanford.edu/~blynn/gitmagic/intl/ru",
-                           "title": "Волшебство Git"
-                        },
-                        {
-                           "url": "http://rogerdudler.github.io/git-guide/index.ru.html",
-                           "title": "Простое руководство по работе с Git"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/git",
-                           "title": "Руководство по Git"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/ru/v2",
-                           "title": "Pro Git"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "http://golang-book.ru",
-                           "title": "Введение в программирование на Go"
-                        },
-                        {
-                           "url": "https://metanit.com/go/tutorial",
-                           "title": "Руководство по языку Go"
-                        },
-                        {
-                           "url": "https://github.com/Konstantin8105/Effective_Go_RU",
-                           "title": "Эффективный Go"
-                        },
-                        {
-                           "url": "https://gobyexample.ru",
-                           "title": "Go в примерах"
-                        },
-                        {
-                           "url": "https://sefus.ru/little-go-book",
-                           "title": "The Little Go Book (перевод)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "https://www.ohaskell.guide",
-                           "title": "О Haskell по-человечески"
-                        },
-                        {
-                           "url": "http://anton-k.github.io/ru-haskell-book/book/home.html",
-                           "title": "Учебник по Haskell"
-                        },
-                        {
-                           "url": "http://www.haskell.ru",
-                           "title": "Язык и библиотеки Haskell 98"
-                        },
-                        {
-                           "url": "https://github.com/Number571/Haskell/tree/master/Book",
-                           "title": "Язык программирования Haskell: Учимся быть ленивыми"
-                        },
-                        {
-                           "url": "https://bitbucket.org/darkus/yesod/downloads",
-                           "title": "Developing Web Applications with Haskell and Yesod"
-                        },
-                        {
-                           "url": "https://wiki.nsunc.com/_export/html/haskell",
-                           "title": "Haskell: введение в функциональное программирование"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML / CSS",
-                     "entries": [
-                        {
-                           "url": "https://metanit.com/web/html5",
-                           "title": "Руководство по HTML5 и CSS3"
-                        },
-                        {
-                           "url": "http://htmlbook.ru/html",
-                           "title": "Справочник по HTML"
-                        },
-                        {
-                           "url": "http://htmlbook.ru/css",
-                           "title": "Справочник CSS"
-                        },
-                        {
-                           "url": "https://html5book.ru/css-css3",
-                           "title": "CSS и CSS3"
-                        },
-                        {
-                           "url": "https://html5book.ru/html-html5",
-                           "title": "HTML и HTML5"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Bootstrap",
-                           "entries": [
-                              {
-                                 "url": "http://getbootstrap.ru/docs/v4-alpha",
-                                 "title": "Bootstrap 4"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://metanit.com/java/tutorial",
-                           "title": "Руководство по языку программирования Java"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/java-core",
-                           "title": "Руководство по Java Core"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/servlets",
-                           "title": "Руководство по Servlets"
-                        },
-                        {
-                           "url": "https://vertex-academy.com/tutorials/ru/samouchitel-po-java-s-nulya/",
-                           "title": "Самоучитель по Java с нуля"
-                        },
-                        {
-                           "url": "http://javastudy.ru/interview/list-of-question-java-interview",
-                           "title": "Собеседование по Java Core"
-                        },
-                        {
-                           "url": "http://javastudy.ru/interview/list-of-questions-javaee-interview",
-                           "title": "Собеседование по Java EE"
-                        },
-                        {
-                           "url": "https://vertex-academy.com/tutorials/ru/java-8-uchebnik/",
-                           "title": "Учебник по Java 8"
-                        },
-                        {
-                           "url": "https://vertex-academy.com/tutorials/ru/java-9-uchebnik-teoriya-primery/",
-                           "title": "Учебник по Java 9"
-                        },
-                        {
-                           "url": "https://urvanov.ru/2016/03/23/%D1%83%D1%87%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA-java-8",
-                           "title": "Учебник Java 8"
-                        },
-                        {
-                           "url": "https://easyjava.ru/java/yazyk-java/",
-                           "title": "Язык Java 8"
-                        },
-                        {
-                           "url": "http://www.fandroid.info/tutorial-po-osnovam-yazyka-programmirovaniya-java-dlya-nachinayushhih/",
-                           "title": "Java Basics"
-                        },
-                        {
-                           "url": "http://myflex.org/books/java4kids/java4kids.htm",
-                           "title": "Java Programming for Kids, Parents and Grandparents"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Android",
-                           "entries": [
-                              {
-                                 "url": "https://metanit.com/java/android",
-                                 "title": "Программирование под Android"
-                              },
-                              {
-                                 "url": "http://startandroid.ru/ru/uroki/vse-uroki-spiskom.html",
-                                 "title": "Уроки по Android"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "EasyMock",
-                           "entries": [
-                              {
-                                 "url": "https://easyjava.ru/testirovanie/easymock/",
-                                 "title": "EasyMock 3"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Hibernate",
-                           "entries": [
-                              {
-                                 "url": "http://proselyte.net/tutorials/hibernate-tutorial",
-                                 "title": "Руководство по Hibernate"
-                              },
-                              {
-                                 "url": "https://easyjava.ru/data/hibernate/",
-                                 "title": "Hibernate"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "JDBC",
-                           "entries": [
-                              {
-                                 "url": "http://proselyte.net/tutorials/jdbc",
-                                 "title": "Руководство по JDBC"
-                              },
-                              {
-                                 "url": "https://easyjava.ru/data/jdbc/",
-                                 "title": "JDBC и Spring JDBC"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "JUnit",
-                           "entries": [
-                              {
-                                 "url": "http://proselyte.net/tutorials/junit",
-                                 "title": "Руководство по JUnit"
-                              },
-                              {
-                                 "url": "https://easyjava.ru/testirovanie/junit-2/",
-                                 "title": "JUnit 4"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Maven",
-                           "entries": [
-                              {
-                                 "url": "http://proselyte.net/tutorials/maven",
-                                 "title": "Руководство по Maven"
-                              },
-                              {
-                                 "url": "https://easyjava.ru/ekosistema/sredstva-sborki/apache-maven/",
-                                 "title": "Apache Maven"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spring",
-                           "entries": [
-                              {
-                                 "url": "http://proselyte.net/tutorials/spring-tutorial-full-version",
-                                 "title": "Руководство по Spring"
-                              },
-                              {
-                                 "url": "https://easyjava.ru/spring/",
-                                 "title": "Spring Framework"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "https://github.com/azat-io/you-dont-know-js-ru",
-                           "title": "Вы не знаете JS (серия книг)"
-                        },
-                        {
-                           "url": "https://github.com/karmazzin/eloquentjavascript_ru",
-                           "title": "Выразительный JavaScript"
-                        },
-                        {
-                           "url": "https://bxnotes.ru/conspect/kurs-sovremennogo-javascript/",
-                           "title": "Курс современного JavaScript"
-                        },
-                        {
-                           "url": "https://metanit.com/web/webgl",
-                           "title": "Онлайн-книга по WebGL"
-                        },
-                        {
-                           "url": "http://largescalejs.ru",
-                           "title": "Паттерны для масштабируемых JavaScript-приложений"
-                        },
-                        {
-                           "url": "https://metanit.com/web/javascript",
-                           "title": "Руководство по JavaScript"
-                        },
-                        {
-                           "url": "http://learn.javascript.ru",
-                           "title": "Современный учебник JavaScript"
-                        },
-                        {
-                           "url": "https://html5book.ru/javascript-jquery",
-                           "title": "JavaScript и jQuery"
-                        },
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/ru",
-                           "title": "JavaScript Garden"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "https://metanit.com/web/angular",
-                                 "title": "Онлайн-руководство по AngularJS"
-                              },
-                              {
-                                 "url": "http://angular-doc.herokuapp.com",
-                                 "title": "Перевод документации"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "jQuery",
-                           "entries": [
-                              {
-                                 "url": "https://metanit.com/web/jquery",
-                                 "title": "Онлайн-книга \"Изучаем jQuery\""
-                              },
-                              {
-                                 "url": "https://jquery-docs.ru",
-                                 "title": "Русская документация по API jQuery"
-                              },
-                              {
-                                 "url": "http://anton.shevchuk.name/jquery-book",
-                                 "title": "jQuery для начинающих"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "https://metanit.com/web/nodejs",
-                                 "title": "Руководство по Node.js"
-                              },
-                              {
-                                 "url": "http://nodebeginner.ru",
-                                 "title": "Node.js для начинающих"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Nuxt.js",
-                           "entries": [
-                              {
-                                 "url": "https://ru.nuxtjs.org",
-                                 "title": "Перевод документации"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React",
-                           "entries": [
-                              {
-                                 "url": "https://learn-reactjs.ru/home",
-                                 "title": "Перевод документации"
-                              },
-                              {
-                                 "url": "https://leanpub.com/the-road-to-learn-react-russian",
-                                 "title": "Путь к изучению React"
-                              },
-                              {
-                                 "url": "https://metanit.com/web/react",
-                                 "title": "Руководство по React"
-                              },
-                              {
-                                 "url": "https://codedzen.ru/category/uroki/react",
-                                 "title": "Уроки по React"
-                              },
-                              {
-                                 "url": "http://old.code.mu/books/advanced/javascript/react/",
-                                 "title": "Учебник по фреймворку React"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Vue.js",
-                           "entries": [
-                              {
-                                 "url": "https://ru.vuejs.org",
-                                 "title": "Перевод документации"
-                              },
-                              {
-                                 "url": "https://metanit.com/web/vuejs",
-                                 "title": "Руководство по Vue.js"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Kotlin",
-                     "entries": [
-                        {
-                           "url": "http://kotlinlang.ru",
-                           "title": "Руководство по языку Kotlin"
-                        },
-                        {
-                           "url": "https://metanit.com/java/kotlin",
-                           "title": "Руководство по языку Kotlin"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://www.stolyarov.info/books/pdf/latex3days.pdf",
-                           "title": "LaTeX за три дня"
-                        },
-                        {
-                           "url": "http://www.inp.nsk.su/~baldin/LaTeX/index.html",
-                           "title": "LaTeX, GNU/Linux и русский стиль (сборник статей)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lisp",
-                     "entries": [
-                        {
-                           "url": "http://lisper.ru/wiki/Cookbook",
-                           "title": "Common Lisp Cookbook (перевод)"
-                        },
-                        {
-                           "url": "https://github.com/ilammy/lisp",
-                           "title": "Lisp In Small Pieces (translation)"
-                        },
-                        {
-                           "url": "http://lisper.ru/pcl/",
-                           "title": "Practical Common Lisp (перевод)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MetaPost",
-                     "entries": [
-                        {
-                           "url": "http://www.inp.nsk.su/~baldin/mpost/index.html",
-                           "title": "Создание иллюстраций в MetaPost"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": ".NET",
-                     "entries": [
-                        {
-                           "url": "https://metanit.com/sharp/adonet",
-                           "title": "Руководство по ADO.NET и работе с базами данных"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/aspnet5",
-                           "title": "Руководство по ASP.NET Core 2.0"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/mvc5",
-                           "title": "Руководство по ASP.NET MVC 5"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/aspnet_webapi",
-                           "title": "Руководство по ASP.NET Web API 2"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/entityframeworkcore",
-                           "title": "Руководство по EF Core"
-                        },
-                        {
-                           "url": "https://metanit.com/sharp/entityframework",
-                           "title": "Руководство по Entity Framework"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "NoSQL",
-                     "entries": [
-                        {
-                           "url": "http://www.pvsm.ru/download/mongodb-ru.pdf",
-                           "title": "Маленькая книга о MongoDB"
-                        },
-                        {
-                           "url": "https://github.com/kondratovich/the-little-redis-book/blob/master/ru/redis.md",
-                           "title": "Маленькая книга о Redis"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/mongodb",
-                           "title": "Руководство по MongoDB"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Objective-C",
-                     "entries": [
-                        {
-                           "url": "https://maleevdimka.files.wordpress.com/2013/04/ios-patterns-cliff-notes2.pdf",
-                           "title": "Хрестоматия iOS паттернов"
-                        },
-                        {
-                           "url": "http://habrahabr.ru/post/149090/",
-                           "title": "Цикл статей разработки под Apple iOS"
-                        },
-                        {
-                           "url": "https://yadi.sk/d/ugz7jW4RXLGTN",
-                           "title": "Become an XCoder"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "http://www.opennet.ru/docs/RUS/perl-maslov/",
-                           "title": "Введение в Perl"
-                        },
-                        {
-                           "url": "http://www.opennet.ru/docs/RUS/perl_help/",
-                           "title": "Краткий экскурс в Perl-программирование"
-                        },
-                        {
-                           "url": "http://pragmaticperl.com",
-                           "title": "Pragmatic Perl"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://docs.php.net/manual/ru",
-                           "title": "Руководство по PHP"
-                        },
-                        {
-                           "url": "https://phpunit.readthedocs.io/ru/latest/",
-                           "title": "Руководство по PHPUnit"
-                        },
-                        {
-                           "url": "http://www.php-s.ru/self-teacher",
-                           "title": "Самоучитель (учебник) по PHP"
-                        },
-                        {
-                           "url": "http://getjump.github.io/ru-php-the-right-way",
-                           "title": "PHP: Правильный Путь"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "CakePHP",
-                           "entries": [
-                              {
-                                 "url": "https://book.cakephp.org/3.0/ru/index.html",
-                                 "title": "Руководство"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "CodeIgniter",
-                           "entries": [
-                              {
-                                 "url": "http://codeigniter3.info",
-                                 "title": "CodeIgniter"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Laravel",
-                           "entries": [
-                              {
-                                 "url": "https://laravel.ru/docs/v5",
-                                 "title": "Документация 5.x"
-                              },
-                              {
-                                 "url": "http://laravel.su/docs",
-                                 "title": "Перевод документации"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/ru/index.html",
-                                 "title": "Symfony 5. Быстрый старт"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "http://ru.diveintopython.net/toc.html",
-                           "title": "Вглубь языка Python"
-                        },
-                        {
-                           "url": "http://dfedorov.spb.ru/python3",
-                           "title": "Основы программирования на Python"
-                        },
-                        {
-                           "url": "https://metanit.com/python/tutorial",
-                           "title": "Руководство по языку программирования Python"
-                        },
-                        {
-                           "url": "https://pythonworld.ru/samouchitel-python",
-                           "title": "Самоучитель Python"
-                        },
-                        {
-                           "url": "http://wombat.org.ua/AByteOfPython",
-                           "title": "Укус Питона"
-                        },
-                        {
-                           "url": "https://ru.wikibooks.org/wiki/Учебник_Python_2.6",
-                           "title": "Учебник Python 2.6"
-                        },
-                        {
-                           "url": "https://aliev.github.io/runestone",
-                           "title": "Problem Solving with Algorithms and Data Structures"
-                        },
-                        {
-                           "url": "https://younglinux.info/oopython.php",
-                           "title": "Python. Введение в объектно-ориентированное программирование"
-                        },
-                        {
-                           "url": "https://younglinux.info/python.php",
-                           "title": "Python. Введение в программирование"
-                        },
-                        {
-                           "url": "https://devpractice.ru/book-python-lessons",
-                           "title": "Python. Уроки"
-                        },
-                        {
-                           "url": "https://devpractice.ru/book-python-unittest",
-                           "title": "Python. unittest"
-                        },
-                        {
-                           "url": "https://younglinux.info/tkinter.php",
-                           "title": "Tkinter. Программирование графического интерфейса"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://metanit.com/python/django",
-                                 "title": "Руководство по веб-фреймворку Django"
-                              },
-                              {
-                                 "url": "https://tutorial.djangogirls.org/ru",
-                                 "title": "Руководство Django Girls"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://www.inp.nsk.su/~baldin/DataAnalysis/index.html",
-                           "title": "Анализ данных с R"
-                        },
-                        {
-                           "url": "http://www.ievbras.ru/ecostat/Kiril/Article/A32/Starb.pdf",
-                           "title": "Рандомизация и бутстреп: статистический анализ в биологии и экологии с использованием R."
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "http://linux.yaroslavl.ru/docs/prog/ruby.html",
-                           "title": "Руководство пользователя"
-                        },
-                        {
-                           "url": "http://www.shokhirev.com/mikhail/ruby/ltp/title.html",
-                           "title": "Учись программировать"
-                        },
-                        {
-                           "url": "https://ru.wikibooks.org/wiki/Ruby",
-                           "title": "Ruby"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/ru/documentation/quickstart",
-                           "title": "Ruby за двадцать минут"
-                        },
-                        {
-                           "url": "https://github.com/Krugloff/rus_ruby_book",
-                           "title": "Ruby Book"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "RSpec",
-                           "entries": [
-                              {
-                                 "url": "http://betterspecs.org/ru",
-                                 "title": "Better Specs (RSpec Guidelines with Ruby)"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Ruby on Rails",
-                           "entries": [
-                              {
-                                 "url": "http://rusrails.ru",
-                                 "title": "Ruby on Rails по-русски"
-                              },
-                              {
-                                 "url": "http://railstutorial.ru/chapters/4_0/beginning",
-                                 "title": "Ruby on Rails Tutorial. Изучение Rails на Примерах"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Rust",
-                     "entries": [
-                        {
-                           "url": "https://github.com/ruRust/rustonomicon",
-                           "title": "Растономикон"
-                        },
-                        {
-                           "url": "http://rurust.github.io/rust_book_ru",
-                           "title": "Язык программирования Rust"
-                        },
-                        {
-                           "url": "https://rurust.github.io/rust-by-example-ru",
-                           "title": "Rust на примерах"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scala",
-                     "entries": [
-                        {
-                           "url": "https://github.com/anton-k/ru-neophyte-guide-to-scala",
-                           "title": "Путеводитель неофита по Scala (перевод серии статей Даниеля Вестсайда)"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/scala",
-                           "title": "Руководство по Scala"
-                        },
-                        {
-                           "url": "http://twitter.github.io/effectivescala/index-ru.html",
-                           "title": "Effective Scala"
-                        },
-                        {
-                           "url": "http://twitter.github.io/scala_school/ru",
-                           "title": "Scala Школа!"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scilab",
-                     "entries": [
-                        {
-                           "url": "http://forge.scilab.org/index.php/p/docintrotoscilab/downloads",
-                           "title": "Введение в Scilab"
-                        },
-                        {
-                           "url": "http://forge.scilab.org/index.php/p/docprogscilab/downloads",
-                           "title": "Программирование в Scilab"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "https://www.dropbox.com/s/qsthpk5r6gqmi6u/CreativeComputing_RUS_june2016.pdf?dl=0",
-                           "title": "Креативное программирование"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Smalltalk",
-                     "entries": [
-                        {
-                           "url": "https://sites.google.com/site/polyglotsqueak",
-                           "title": "Смолток: Язык и его реализация"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL",
-                     "entries": [
-                        {
-                           "url": "http://svyatoslav.biz/database_book/",
-                           "title": "Работа с MySQL, MS SQL Server и Oracle в примерах"
-                        },
-                        {
-                           "url": "https://metanit.com/sql/sqlserver",
-                           "title": "Руководство по MS SQL Server 2017"
-                        },
-                        {
-                           "url": "http://proselyte.net/tutorials/sql",
-                           "title": "Руководство по SQL"
-                        },
-                        {
-                           "url": "https://postgrespro.ru/education/books/sqlprimer",
-                           "title": "Язык SQL. Базовый курс"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "FirebirdSQL",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/sim1984/fbmigrgd40/releases/download/1.0/doc.rus.pdf",
-                                 "title": "Краткое руководство по миграции на Firebird 4.0"
-                              },
-                              {
-                                 "url": "http://www.ibase.ru/files/firebird/Firebird_Hardware_Guide_2015_rus.pdf",
-                                 "title": "Руководство по аппаратному обеспечению для Firebird"
-                              },
-                              {
-                                 "url": "https://github.com/sim1984/udr-book",
-                                 "title": "Руководство по написанию UDR на Pascal"
-                              },
-                              {
-                                 "url": "http://www.ibase.ru/files/firebird/Firebird_3_0_Language_Reference_RUS.pdf",
-                                 "title": "Руководство по языку Firebird 3.0"
-                              },
-                              {
-                                 "url": "http://www.ibase.ru/files/firebird/Firebird_4_0_Language_Reference_RUS.pdf",
-                                 "title": "Руководство по языку Firebird 4.0"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "PostgreSQL",
-                           "entries": [
-                              {
-                                 "url": "https://postgrespro.ru/docs/postgresql",
-                                 "title": "Документация"
-                              },
-                              {
-                                 "url": "http://www.inp.nsk.su/~baldin/PostgreSQL/index.html",
-                                 "title": "История о PostgreSQL"
-                              },
-                              {
-                                 "url": "http://postgresql.leopard.in.ua",
-                                 "title": "Работа с PostgreSQL - настройка и масштабирование"
-                              },
-                              {
-                                 "url": "https://postgrespro.ru/education/books/introbook",
-                                 "title": "PostgreSQL для начинающих"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Swift",
-                     "entries": [
-                        {
-                           "url": "https://swiftbook.ru",
-                           "title": "Документация и туториалы"
-                        },
-                        {
-                           "url": "https://swift.org/documentation",
-                           "title": "Documentation"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "http://typescript-lang.ru/docs/",
-                           "title": "Перевод официальной документации Typescript"
-                        },
-                        {
-                           "url": "https://metanit.com/web/typescript",
-                           "title": "Руководство по TypeScript"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://metanit.com/web/angular2",
-                                 "title": "Руководство по Angular"
-                              },
-                              {
-                                 "url": "https://angular24.ru",
-                                 "title": "Русская версия документация Angular 10"
-                              },
-                              {
-                                 "url": "https://bxnotes.ru/conspect/angular-5-the-complete-guide/",
-                                 "title": "Angular 5. Полное руководство"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Unix",
-                     "entries": [],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Vim",
-                     "entries": [
-                        {
-                           "url": "http://www.opennet.ru/docs/RUS/vim_cookbook",
-                           "title": "Поваренная Книга Vim"
-                        },
-                        {
-                           "url": "http://rus-linux.net/MyLDP/BOOKS/Vim/prosto-o-vim.pdf",
-                           "title": "Просто о Vim"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "se",
-                  "name": "Northern Sami"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://sv.wikibooks.org/wiki/C-programmering",
-                           "title": "C-programmering"
-                        },
-                        {
-                           "url": "https://sv.wikibooks.org/wiki/Programmera_spel_i_C%2B%2B_f%C3%B6r_nyb%C3%B6rjare",
-                           "title": "Programmera spel i C++ för nybörjare"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MATLAB",
-                     "entries": [
-                        {
-                           "url": "https://www.liber.se/plus/E470523401.pdf",
-                           "title": "Introduktion till MATLAB"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://sv.wikibooks.org/wiki/Programmera_i_PHP",
-                           "title": "Programmera i PHP"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "sk",
-                  "name": "Slovak"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "Language Agnostic",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Právo",
-                           "entries": [
-                              {
-                                 "url": "https://knihy.nic.cz",
-                                 "title": "Zodpovednosť na internete"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/sk/",
-                                 "title": "Príručka k Django Girls"
-                              }
-                           ]
-                        }
-                     ]
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "ta",
-                  "name": "Tamil"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "CSS",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/download/learn-css-in-tamil.pdf",
-                           "title": "எளிய தமிழில் CSS"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Database",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/mysql-book-in-tamil/",
-                           "title": "எளிய தமிழில் MySQL "
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/learn-css-in-tamil-ebook/",
-                           "title": "எளிய தமிழில் CSS"
-                        },
-                        {
-                           "url": "http://www.kaniyam.com/learn-html-in-tamil/",
-                           "title": "எளிய தமிழில் HTML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/learn-javascript-in-tamil/",
-                           "title": "எளிய தமிழில் JavaScript"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MachineLearning",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/download/e0ae8ee0aeb3e0aebfe0aeaf-e0aea4e0aeaee0aebfe0aeb4e0aebfe0aeb2e0af8d-machine-learning-a4-pdf.html",
-                           "title": "எளிய தமிழில் ML"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/mysql-book-in-tamil/",
-                           "title": "எளிய தமிழில் MySQL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://freetamilebooks.com/ebooks/learn-php-in-tamil/",
-                           "title": "எளிய தமிழில் PHP"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/download/learn-ruby-in-tamil.pdf",
-                           "title": "எளிய இனிய கணினி மொழி Ruby"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Selenium",
-                     "entries": [
-                        {
-                           "url": "http://www.kaniyam.com/download/learn-selenium-in-tamil.pdf",
-                           "title": "எளிய தமிழில் Selenium"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "th",
-                  "name": "Thai"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "IoT (internet of things)",
-                     "entries": [
-                        {
-                           "url": "https://www.nectec.or.th/news/news-public-document/introwsn.html",
-                           "title": "Introduction to Wireless Sensor Networks-แนะนำเครือข่ายเซนเซอร์ไร้สาย"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://www.cp.eng.chula.ac.th/books/ds-vjjv/",
-                           "title": "โครงสร้างข้อมูลฉบับวาจาจาวา"
-                        },
-                        {
-                           "url": "http://it.e-tech.ac.th/poohdevil/JavaConcepts/",
-                           "title": "Java Programming Concept"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://www.cp.eng.chula.ac.th/books/python101/",
-                           "title": "Python ๑๐๑"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "tr",
-                  "name": "Turkish"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "Algoritma ve Veri Yapıları",
-                     "entries": [
-                        {
-                           "url": "https://ia601404.us.archive.org/34/items/algoritma-ve-programlama-soru-bankasi/algoritma-ve-programlama-soru-bankas%C4%B1.pdf",
-                           "title": "Algoritma ve Programlama Soru Bankası"
-                        },
-                        {
-                           "url": "https://ia601404.us.archive.org/12/items/algoritma-ve-programlamaya-giris-ders-notlari/Algoritma%20ve%20Programlamaya%20Giri%C5%9F%20Ders%20Notlar%C4%B1.pdf",
-                           "title": "Algoritma ve Programlamaya Giriş Ders Notları"
-                        },
-                        {
-                           "url": "https://ia601408.us.archive.org/31/items/algoritmalar-ve-programlama/Algoritmalar%20ve%20Programlama.pdf",
-                           "title": "Algoritmalar ve Programlama"
-                        },
-                        {
-                           "url": "https://ia601504.us.archive.org/20/items/bilgisayar-teriminde-algoritma/Bilgisayar%20Teriminde%20Algoritma.pdf",
-                           "title": "Bilgisayar Teriminde Algoritma"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "https://umiitkose.com/android",
-                           "title": "Android Dersleri"
-                        },
-                        {
-                           "url": "https://gelecegiyazanlar.turkcell.com.tr/konu/android",
-                           "title": "Android Geleceği Yazanlar"
-                        },
-                        {
-                           "url": "http://umiitkose.com/wp-content/uploads/2015/08/AndroidStudio.pdf",
-                           "title": "Android Türkçe PDF"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://www.belgeler.org/bgnet/bgnet.html",
-                           "title": "Beej'in Ağ Programlama Kılavuzu - Internet Soketlerini Kullanarak"
-                        },
-                        {
-                           "url": "http://www.belgeler.org/glibc/glibc.html",
-                           "title": "GNU C Kütüphanesi Basvuru Klavuzu"
-                        },
-                        {
-                           "url": "https://www.yusufsezer.com.tr/cpp-dersleri/",
-                           "title": "C++ Dersleri"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CSS",
-                     "entries": [
-                        {
-                           "url": "http://sercaneraslan.com/css/",
-                           "title": "CSS Giriş"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "D",
-                     "entries": [
-                        {
-                           "url": "https://www.ddili.org/ders/d/D_Programlama_Dili.pdf",
-                           "title": "D Programlama Dili"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Dart",
-                     "entries": [
-                        {
-                           "url": "https://www.dartogreniyorum.blogspot.com.tr/2013/03/yeniden-dart.html?view=sidebar",
-                           "title": "Dart - Merhaba Dünya"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "https://www.rogerdudler.github.io/git-guide/index.tr.html",
-                           "title": "git - basit rehber"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/aliozgur/git101/details",
-                           "title": "Git 101"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "https://www.github.com/umutphp/the-little-go-book",
-                           "title": "Go El Kitabı"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Güvenlik ve Gizlilik",
-                     "entries": [
-                        {
-                           "url": "https://guvenlik.oyd.org.tr",
-                           "title": "Özgür Yazılım Derneği Güvenlik Rehberi"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Html",
-                     "entries": [
-                        {
-                           "url": "http://www.htmldersleri.org",
-                           "title": "Html'e Giriş"
-                        },
-                        {
-                           "url": "https://www.github.com/paufsc/journey-to-html",
-                           "title": "Html'e Yolculuk"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "iOS",
-                     "entries": [
-                        {
-                           "url": "https://gelecegiyazanlar.turkcell.com.tr/konu/ios",
-                           "title": "iOS Geleceği Yazanlar"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://ia601505.us.archive.org/23/items/24-saatte-java/24-saatte-java-turkce.pdf",
-                           "title": "24 Saatte Java"
-                        },
-                        {
-                           "url": "http://www.baskent.edu.tr/~tkaracay/etudio/ders/prg/java/java_ndx.html",
-                           "title": "Başkent Üniversitesi Java Dersleri"
-                        },
-                        {
-                           "url": "http://www.turhancoban.com/kitap/JAVA%20B%C4%B0LG%C4%B0SAYAR%20D%C4%B0L%C4%B0YLE%20PROGRAMLAMA.pdf",
-                           "title": "Java Bilgisayar Diliyle Programlama"
-                        },
-                        {
-                           "url": "https://ia801507.us.archive.org/12/items/java-ile-nesneye-yonelik-programlama/Java%20ile%20Nesneye%20Y%C3%B6nelik%20Programlama.pdf",
-                           "title": "Java ile Nesneye Yönelik Programlama"
-                        },
-                        {
-                           "url": "https://ia601503.us.archive.org/27/items/java-kitabi/java-kitabi.pdf",
-                           "title": "Java Kitabı"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/tr",
-                           "title": "JavaScript Garden"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "http://www.ctan.org/tex-archive/info/lshort/turkish",
-                           "title": "İnce bir LaTeX2ε Elkitabı"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "http://www.belgeler.org/bashref/bashref.html",
-                           "title": "GNU Bash Başvuru Kılavuzu"
-                        },
-                        {
-                           "url": "https://www.fullportal.org/GNULINUX/Komutlar/GNULINUXKOMUTLAR.pdf",
-                           "title": "GNU Linux Komutlari"
-                        },
-                        {
-                           "url": "http://www.belgeler.org/howto/howtos.html",
-                           "title": "Linux Belgeleri"
-                        },
-                        {
-                           "url": "http://www.belgeler.org/sag/sag.html",
-                           "title": "Linux Sistem Yöneticisinin Kılavuzu"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Matlab",
-                     "entries": [
-                        {
-                           "url": "https://www.ismailari.com/blog/matlab-programlamaya-giris",
-                           "title": "Matlab Programlamaya Giris"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": ".NET Framework",
-                     "entries": [
-                        {
-                           "url": "https://sahin.gitbook.io/asp-net-core-el-kitab",
-                           "title": "ASP.NET Core El Kitabı"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://www.leanpub.com/laravel4-tr",
-                           "title": "PHP - Laravel 4 Türkçe Dokumantasyon"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://www.ofenerci.github.io/thinkcspy-tr",
-                           "title": "Bilgisayar Bilimcisi Gibi Düşünmek-Python3 ile Öğrenme"
-                        },
-                        {
-                           "url": "https://python-istihza.yazbel.com",
-                           "title": "Python Programlama Dili"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Django",
-                     "entries": [
-                        {
-                           "url": "https://www.pythondersleri.com/p/django-egitim-serisi.html",
-                           "title": "Django"
-                        },
-                        {
-                           "url": "https://gokmengorgen.net/django-notes",
-                           "title": "Django Egitimi"
-                        },
-                        {
-                           "url": "https://tutorial.djangogirls.org/tr",
-                           "title": "Django Girls Eğitimi"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "https://www.github.com/emraher/eybkbrk",
-                           "title": "Ekonometriye Yeni Başlayanlar için Kısa bir R Kılavuzu"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://github.com/leylaKapi/AB2014-Ruby-Programlama-Dili/blob/master/Ruby_AB2014.md",
-                           "title": "AB2014 Ruby Programlama Dili"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/tr",
-                           "title": "Ruby"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/vigo/ruby-101/details",
-                           "title": "Ruby 101"
-                        },
-                        {
-                           "url": "http://www.belgeler.org/uygulamalar/ruby/ruby-ug.html",
-                           "title": "Ruby Kullanıcı Kılavuzu"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/tr/documentation/quickstart",
-                           "title": "Yirmi Dakikada Ruby"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Rust",
-                     "entries": [
-                        {
-                           "url": "http://bit.ly/rustagiris",
-                           "title": "Rust'a Giriş"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": ""
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "ClojureScript",
-                     "entries": [
-                        {
-                           "url": "https://lambdabooks.github.io/clojurescript-unraveled",
-                           "title": "Розплутаний ClojureScript"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "http://haskell.trygub.com",
-                           "title": "Вивчить собі Хаскела на велике щастя!"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML / CSS",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Bootstrap",
-                           "entries": [
-                              {
-                                 "url": "http://twbs.docs.org.ua",
-                                 "title": "Ознайомлення Bootstrap 3.3.2"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://myflex.org/books/java4kids/java4kids.htm",
-                           "title": "Програмування мовою Java для дітей, батьків, дідусів та бабусь"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://understandinges6.denysdovhan.com",
-                           "title": "Розуміння ECMAScript 6"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Language Agnostic",
-                     "entries": [
-                        {
-                           "url": "http://designpatterns.andriybuday.com",
-                           "title": "Дизайн патерни - просто, як двері"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://uk.wikibooks.org/wiki/Пориньте_у_Python_3",
-                           "title": "Пориньте у Python 3"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/uk/",
-                                 "title": "Навчальний посібник Django Girls"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://lambdabooks.github.io/thelittlebookofruby",
-                           "title": "Маленька книга про Ruby"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "vi",
-                  "name": "Vietnamese"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "<a name=\"golang\">",
-                     "entries": [
-                        {
-                           "url": "https://github.com/nainglinaung/the-little-go-book",
-                           "title": "The Little Go Book"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "zh",
-                  "name": "Chinese"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "编程艺术",
-                     "entries": [
-                        {
-                           "url": "http://www.kancloud.cn/kancloud/intro-to-prog/52592",
-                           "title": "编程入门指南"
-                        },
-                        {
-                           "url": "https://github.com/julycoding/The-Art-Of-Programming-by-July",
-                           "title": "程序员编程艺术"
-                        },
-                        {
-                           "url": "http://www.oschina.net/translate/what-every-programmer-should-know-about-memory-part1",
-                           "title": "每个程序员都应该了解的内存知识 (第一部分)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "编辑器",
-                     "entries": [
-                        {
-                           "url": "http://learnvimscriptthehardway.onefloweroneworld.com",
-                           "title": "笨方法学Vimscript 中译本"
-                        },
-                        {
-                           "url": "https://github.com/yangyangwithgnu/use_vim_as_ide",
-                           "title": "所需即所获：像 IDE 一样使用 vim"
-                        },
-                        {
-                           "url": "http://exvim.github.io/docs-zh/intro/",
-                           "title": "exvim--vim 改良成IDE项目"
-                        },
-                        {
-                           "url": "https://github.com/vimcn/vimcdoc",
-                           "title": "Vim中文文档"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "编译原理",
-                     "entries": [
-                        {
-                           "url": "https://github.com/DeathKing/Learning-SICP",
-                           "title": "《计算机程序的结构和解释》公开课 翻译项目"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "操作系统",
-                     "entries": [
-                        {
-                           "url": "http://i.linuxtoy.org/docs/guide/index.html",
-                           "title": "开源世界旅行手册"
-                        },
-                        {
-                           "url": "https://github.com/tobegit3hub/understand_linux_process",
-                           "title": "理解Linux进程"
-                        },
-                        {
-                           "url": "https://github.com/jlevy/the-art-of-command-line/blob/master/README-zh.md",
-                           "title": "命令行的艺术"
-                        },
-                        {
-                           "url": "http://cn.linux.vbird.org/linux_server/",
-                           "title": "鸟哥的 Linux 私房菜 服务器架设篇"
-                        },
-                        {
-                           "url": "http://cn.linux.vbird.org/linux_basic/linux_basic.php",
-                           "title": "鸟哥的 Linux 私房菜 基础学习篇"
-                        },
-                        {
-                           "url": "https://tinylab.gitbooks.io/elinux/content/zh/",
-                           "title": "嵌入式 Linux 知识库 (eLinux.org 中文版)"
-                        },
-                        {
-                           "url": "https://github.com/yeasy/docker_practice",
-                           "title": "Docker — 从入门到实践"
-                        },
-                        {
-                           "url": "http://yuedu.baidu.com/ebook/d817967416fc700abb68fca1",
-                           "title": "Docker入门实战"
-                        },
-                        {
-                           "url": "https://github.com/widuu/chinese_docker",
-                           "title": "Docker中文指南"
-                        },
-                        {
-                           "url": "http://www.freebsd.org/doc/zh_CN.UTF-8/books/handbook/",
-                           "title": "FreeBSD 使用手册"
-                        },
-                        {
-                           "url": "http://works.jinbuguo.com/lfs/lfs62/index.html",
-                           "title": "Linux 构建指南"
-                        },
-                        {
-                           "url": "http://sourceforge.net/projects/elpi/",
-                           "title": "Linux 系统高级编程"
-                        },
-                        {
-                           "url": "https://tinylab.gitbooks.io/linux-doc/content/zh-cn/",
-                           "title": "Linux Documentation (中文版)"
-                        },
-                        {
-                           "url": "http://happypeter.github.io/LGCB/book/",
-                           "title": "Linux Guide for Complete Beginners"
-                        },
-                        {
-                           "url": "https://github.com/me115/linuxtools_rst",
-                           "title": "Linux工具快速教程"
-                        },
-                        {
-                           "url": "https://aaaaaashu.gitbooks.io/mac-dev-setup/content/",
-                           "title": "Mac 开发配置手册"
-                        },
-                        {
-                           "url": "http://pages.cs.wisc.edu/~remzi/OSTEP/",
-                           "title": "Operating Systems: Three Easy Pieces"
-                        },
-                        {
-                           "url": "http://billie66.github.io/TLCL/index.html",
-                           "title": "The Linux Command Line"
-                        },
-                        {
-                           "url": "http://wiki.ubuntu.org.cn/UbuntuManual",
-                           "title": "Ubuntu 参考手册"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/objectkuan/ucore-docs/details",
-                           "title": "uCore Lab: Operating System Course in Tsinghua University"
-                        },
-                        {
-                           "url": "http://cb.vu/unixtoolbox_zh_CN.xhtml",
-                           "title": "UNIX TOOLBOX"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "程序员杂谈",
-                     "entries": [
-                        {
-                           "url": "http://www.kancloud.cn/kancloud/a-programmer-prepares",
-                           "title": "程序员的自我修养"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "大数据",
-                     "entries": [
-                        {
-                           "url": "http://dataminingguide.books.yourtion.com",
-                           "title": "面向程序员的数据挖掘指南"
-                        },
-                        {
-                           "url": "https://github.com/linyiqun/DataMiningAlgorithm",
-                           "title": "数据挖掘中经典的算法实现和详细的注释"
-                        },
-                        {
-                           "url": "https://aiyanbo.gitbooks.io/spark-programming-guide-zh-cn/content/",
-                           "title": "Spark 编程指南简体中文版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "分布式系统",
-                     "entries": [
-                        {
-                           "url": "http://dcaoyuan.github.io/papers/pdfs/Scalability.pdf",
-                           "title": "走向分布式"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "管理和监控",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/fuxiaopang/learnelasticsearch/details",
-                           "title": "ElasticSearch 权威指南"
-                        },
-                        {
-                           "url": "http://es.xiaoleilu.com",
-                           "title": "Elasticsearch 权威指南（中文版）"
-                        },
-                        {
-                           "url": "http://kibana.logstash.es",
-                           "title": "ELKstack 中文指南"
-                        },
-                        {
-                           "url": "https://github.com/chenryn/logstash-best-practice-cn",
-                           "title": "Logstash 最佳实践"
-                        },
-                        {
-                           "url": "http://udn.yyuap.com/doc/mastering-elasticsearch/",
-                           "title": "Mastering Elasticsearch(中文版)"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/wizardforcel/puppet-27-cookbook/details",
-                           "title": "Puppet 2.7 Cookbook 中文版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "函数式概念",
-                     "entries": [
-                        {
-                           "url": "https://github.com/justinyhuang/Functional-Programming-For-The-Rest-of-Us-Cn",
-                           "title": "傻瓜函数编程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "计算机图形学",
-                     "entries": [
-                        {
-                           "url": "https://learnopengl-cn.github.io",
-                           "title": "LearnOpenGL CN"
-                        },
-                        {
-                           "url": "https://github.com/zilongshanren/opengl-tutorials",
-                           "title": "OpenGL 教程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "其它",
-                     "entries": [
-                        {
-                           "url": "http://ifeve.com/perfbook/",
-                           "title": "深入理解并行编程"
-                        },
-                        {
-                           "url": "https://community.emc.com/docs/DOC-16067",
-                           "title": "SAN 管理入门系列"
-                        },
-                        {
-                           "url": "http://sketchcn.com/sketch-chinese-user-manual.html#introduce",
-                           "title": "Sketch 中文手册"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "软件开发方法",
-                     "entries": [
-                        {
-                           "url": "https://github.com/justinyhuang/Functional-Programming-For-The-Rest-of-Us-Cn",
-                           "title": "傻瓜函数编程"
-                        },
-                        {
-                           "url": "http://www.infoq.com/cn/minibooks/scrum-xp-from-the-trenches",
-                           "title": "硝烟中的 Scrum 和 XP"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "设计模式",
-                     "entries": [
-                        {
-                           "url": "http://blog.csdn.net/lovelion/article/details/17517213",
-                           "title": "史上最全设计模式导学目录"
-                        },
-                        {
-                           "url": "https://github.com/me115/design_patterns",
-                           "title": "图说设计模式"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "数据库",
-                     "entries": [],
-                     "subsections": []
-                  },
-                  {
-                     "section": "项目相关",
-                     "entries": [
-                        {
-                           "url": "https://github.com/ecomfe/spec",
-                           "title": "编码规范"
-                        },
-                        {
-                           "url": "http://www.ituring.com.cn/book/1143",
-                           "title": "开源软件架构"
-                        },
-                        {
-                           "url": "https://wizardforcel.gitbooks.io/ibm-j-ap",
-                           "title": "让开发自动化系列专栏"
-                        },
-                        {
-                           "url": "https://wizardforcel.gitbooks.io/ibm-j-cq",
-                           "title": "追求代码质量"
-                        },
-                        {
-                           "url": "http://docs.huihoo.com/gnu/linux/gmake.html",
-                           "title": "GNU make 指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/Gradle-2-User-Guide",
-                           "title": "Gradle 2 用户指南"
-                        },
-                        {
-                           "url": "http://yuedu.baidu.com/ebook/f23af265998fcc22bcd10da2",
-                           "title": "Gradle 中文使用文档"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170616013024/http://local.joelonsoftware.com/wiki/Chinese_(Simplified)",
-                           "title": "Joel谈软件"
-                        },
-                        {
-                           "url": "https://github.com/fool2fish/selenium-doc",
-                           "title": "selenium 中文文档"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "在线教育",
-                     "entries": [
-                        {
-                           "url": "http://edu.51cto.com",
-                           "title": "51CTO学院"
-                        },
-                        {
-                           "url": "http://yun.itheima.com",
-                           "title": "黑马程序员"
-                        },
-                        {
-                           "url": "http://www.hubwiz.com",
-                           "title": "汇智网"
-                        },
-                        {
-                           "url": "http://www.jikexueyuan.com",
-                           "title": "极客学院"
-                        },
-                        {
-                           "url": "http://www.jisuanke.com",
-                           "title": "计蒜客"
-                        },
-                        {
-                           "url": "http://www.imooc.com/course/list",
-                           "title": "慕课网"
-                        },
-                        {
-                           "url": "https://www.codecademy.com/?locale_code=zh",
-                           "title": "Codecademy"
-                        },
-                        {
-                           "url": "https://www.codeschool.com",
-                           "title": "CodeSchool"
-                        },
-                        {
-                           "url": "https://www.coursera.org/courses?orderby=upcoming&lngs=zh",
-                           "title": "Coursera"
-                        },
-                        {
-                           "url": "https://learnxinyminutes.com",
-                           "title": "Learn X in Y minutes"
-                        },
-                        {
-                           "url": "https://www.shiyanlou.com",
-                           "title": "shiyanlou"
-                        },
-                        {
-                           "url": "https://teamtreehouse.com",
-                           "title": "TeamTreeHouse"
-                        },
-                        {
-                           "url": "https://www.udacity.com",
-                           "title": "Udacity"
-                        },
-                        {
-                           "url": "https://www.xuetangx.com",
-                           "title": "xuetangX"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "正则表达式",
-                     "entries": [
-                        {
-                           "url": "http://www.runoob.com/regexp/regexp-tutorial.html",
-                           "title": "正则表达式-菜鸟教程"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20161119141236/http://deerchao.net:80/tutorials/regex/regex.htm",
-                           "title": "正则表达式30分钟入门教程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "智能系统",
-                     "entries": [
-                        {
-                           "url": "https://github.com/phodal/designiot",
-                           "title": "一步步搭建物联网系统"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "IDE",
-                     "entries": [
-                        {
-                           "url": "https://github.com/judasn/IntelliJ-IDEA-Tutorial",
-                           "title": "IntelliJ IDEA 简体中文专题教程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Web",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/juntao/3-web-designs-in-3-weeks/details",
-                           "title": "3 Web Designs in 3 Weeks"
-                        },
-                        {
-                           "url": "http://www.20thingsilearned.com/zh-CN/home",
-                           "title": "关于浏览器和网络的 20 项须知"
-                        },
-                        {
-                           "url": "http://jinlong.github.io/2013/08/29/devtoolsecrets/",
-                           "title": "浏览器开发工具的秘密"
-                        },
-                        {
-                           "url": "http://coderlmn.github.io/code-standards/",
-                           "title": "前端代码规范 及 最佳实践"
-                        },
-                        {
-                           "url": "https://github.com/fouber/blog/issues/2",
-                           "title": "前端开发体系建设日记"
-                        },
-                        {
-                           "url": "https://github.com/hacke2/hacke2.github.io/issues/3",
-                           "title": "前端资源分享（二）"
-                        },
-                        {
-                           "url": "https://github.com/hacke2/hacke2.github.io/issues/1",
-                           "title": "前端资源分享（一）"
-                        },
-                        {
-                           "url": "https://community.emc.com/thread/194901",
-                           "title": "一站式学习Wireshark"
-                        },
-                        {
-                           "url": "https://github.com/hoosin/mobile-web-favorites",
-                           "title": "移动前端开发收藏夹"
-                        },
-                        {
-                           "url": "https://github.com/AlloyTeam/Mars",
-                           "title": "移动Web前端知识库"
-                        },
-                        {
-                           "url": "http://deerchao.net/tutorials/regex/regex.htm",
-                           "title": "正则表达式30分钟入门教程"
-                        },
-                        {
-                           "url": "https://github.com/CN-Chrome-DevTools/CN-Chrome-DevTools",
-                           "title": "Chrome 开发者工具中文手册"
-                        },
-                        {
-                           "url": "http://www.ituring.com.cn/minibook/950",
-                           "title": "Chrome扩展及应用开发"
-                        },
-                        {
-                           "url": "http://open.chrome.360.cn/extension_dev/overview.html",
-                           "title": "Chrome扩展开发文档"
-                        },
-                        {
-                           "url": "https://github.com/phodal/growth-ebook",
-                           "title": "Growth: 全栈增长工程师指南"
-                        },
-                        {
-                           "url": "http://www.gruntjs.net",
-                           "title": "Grunt中文文档"
-                        },
-                        {
-                           "url": "https://github.com/nimojs/gulp-book",
-                           "title": "Gulp 入门指南"
-                        },
-                        {
-                           "url": "http://www.gulpjs.com.cn/docs/",
-                           "title": "gulp中文文档"
-                        },
-                        {
-                           "url": "https://github.com/bolasblack/http-api-guide",
-                           "title": "HTTP 接口设计指北"
-                        },
-                        {
-                           "url": "http://yuedu.baidu.com/ebook/478d1a62376baf1ffc4fad99?pn=1",
-                           "title": "HTTP/2.0 中文翻译"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/ye11ow/http2-explained/details",
-                           "title": "http2讲解"
-                        },
-                        {
-                           "url": "https://github.com/darcyliu/google-styleguide/blob/master/JSONStyleGuide.md",
-                           "title": "JSON风格指南"
-                        },
-                        {
-                           "url": "http://man.lupaworld.com/content/network/wireshark/index.html",
-                           "title": "Wireshark用户手册"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "WEB服务器",
-                     "entries": [
-                        {
-                           "url": "http://works.jinbuguo.com/apache/menu22/index.html",
-                           "title": "Apache 中文手册"
-                        },
-                        {
-                           "url": "http://www.ttlsa.com/nginx/nginx-stu-pdf/",
-                           "title": "Nginx教程从入门到精通"
-                        },
-                        {
-                           "url": "http://tengine.taobao.org/book/index.html",
-                           "title": "Nginx开发从入门到精通"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "http://www.apkbus.com/design/index.html",
-                           "title": "Android Design(中文版)"
-                        },
-                        {
-                           "url": "https://github.com/CharonChui/AndroidNote",
-                           "title": "Android Note(开发过程中积累的知识点)"
-                        },
-                        {
-                           "url": "http://leanote.com/blog/post/561658f938f41126b2000298",
-                           "title": "Android6.0新特性详解"
-                        },
-                        {
-                           "url": "https://github.com/bboyfeiyu/android-tech-frontier",
-                           "title": "Android开发技术前线(android-tech-frontier)"
-                        },
-                        {
-                           "url": "http://hukai.me/android-training-course-in-chinese/index.html",
-                           "title": "Google Android官方培训课程中文版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "AWK",
-                     "entries": [
-                        {
-                           "url": "https://github.com/wuzhouhui/awk",
-                           "title": "awk程序设计语言"
-                        },
-                        {
-                           "url": "http://awk.readthedocs.org/en/latest/index.html",
-                           "title": "awk中文指南"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "https://github.com/limingth/NCCL",
-                           "title": "新概念 C 语言教程"
-                        },
-                        {
-                           "url": "https://firebasestorage.googleapis.com/v0/b/gitbook-28427.appspot.com/o/assets%2F-ME5zR-03ZEHgp2kv7bW%2F-MF9EIY-s19_w19_Unae%2F-MF9F-HCs1nLOkY1mLVi%2FBeej-cn-20140429.zip?alt=media&token=de27f96b-2aed-4c97-8879-649638c7559f",
-                           "title": "Beej's Guide to Network Programming 簡體中文版"
-                        },
-                        {
-                           "url": "http://c-faq-chn.sourceforge.net/ccfaq/ccfaq.html",
-                           "title": "C 语言常见问题集"
-                        },
-                        {
-                           "url": "http://docs.linuxtone.org/ebooks/C&CPP/c/",
-                           "title": "Linux C 编程一站式学习"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "http://book.douban.com/subject/24827879/",
-                           "title": "精通C#(第6版)"
-                        },
-                        {
-                           "url": "https://github.com/hellogcc/100-gcc-tips/blob/master/src/index.md",
-                           "title": "100个gcc小技巧"
-                        },
-                        {
-                           "url": "https://github.com/hellogcc/100-gdb-tips/blob/master/src/index.md",
-                           "title": "100个gdb小技巧"
-                        },
-                        {
-                           "url": "http://www.nowamagic.net/librarys/books/contents/c",
-                           "title": "简单易懂的C魔法"
-                        },
-                        {
-                           "url": "http://www.ituring.com.cn/book/1203",
-                           "title": "像计算机科学家一样思考（C++版)"
-                        },
-                        {
-                           "url": "https://tinylab.gitbooks.io/cbook/content/",
-                           "title": "C 语言编程透视"
-                        },
-                        {
-                           "url": "https://github.com/andycai/cprimer",
-                           "title": "C/C++ Primer"
-                        },
-                        {
-                           "url": "https://github.com/forhappy/Cplusplus-Concurrency-In-Practice",
-                           "title": "C++ 并发编程指南"
-                        },
-                        {
-                           "url": "http://www.sunistudio.com/cppfaq/",
-                           "title": "C++ FAQ LITE(中文版)"
-                        },
-                        {
-                           "url": "https://github.com/Mooophy/Cpp-Primer",
-                           "title": "C++ Primer 5th Answers"
-                        },
-                        {
-                           "url": "https://github.com/wuye9036/CppTemplateTutorial",
-                           "title": "C++ Template 进阶指南"
-                        },
-                        {
-                           "url": "https://github.com/leeyiw/cgdb-manual-in-chinese",
-                           "title": "CGDB中文手册"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170615174144/http://sewm.pku.edu.cn/src/paradise/reference/CMake%20Practice.pdf",
-                           "title": "Cmake 实践"
-                        },
-                        {
-                           "url": "http://docs.huihoo.com/gnu/linux/gmake.html",
-                           "title": "GNU make 指南"
-                        },
-                        {
-                           "url": "http://zh-google-styleguide.readthedocs.org/en/latest/google-cpp-styleguide/contents/",
-                           "title": "Google C++ 风格指南"
-                        },
-                        {
-                           "url": "https://github.com/anjuke/zguide-cn",
-                           "title": "ZMQ 指南"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CoffeeScript",
-                     "entries": [
-                        {
-                           "url": "https://github.com/elrrrrrrr/coffeescript-style-guide/blob/master/README-ZH.md",
-                           "title": "CoffeeScript 编程风格指南"
-                        },
-                        {
-                           "url": "https://github.com/geekplux/coffeescript-style-guide",
-                           "title": "CoffeeScript 编码风格指南"
-                        },
-                        {
-                           "url": "http://coffee-script.org",
-                           "title": "CoffeeScript 中文"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Dart",
-                     "entries": [
-                        {
-                           "url": "http://dart.lidian.info/wiki/Language_Tour",
-                           "title": "Dart 语言导览"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Elasticsearch",
-                     "entries": [
-                        {
-                           "url": "https://github.com/looly/elasticsearch-definitive-guide-cn",
-                           "title": "Elasticsearch 权威指南"
-                        },
-                        {
-                           "url": "http://udn.yyuap.com/doc/mastering-elasticsearch/",
-                           "title": "Mastering Elasticsearch(中文版)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Elixir",
-                     "entries": [
-                        {
-                           "url": "https://elixirschool.com/cn/",
-                           "title": "Elixir 编程语言教程"
-                        },
-                        {
-                           "url": "https://github.com/Ljzn/ElixrGettingStartedChinese",
-                           "title": "Elixir Getting Started 中文翻译"
-                        },
-                        {
-                           "url": "https://github.com/Ljzn/MetaProgrammingInElixirChinese",
-                           "title": "Elixir元编程与DSL 中文翻译"
-                        },
-                        {
-                           "url": "https://mydearxym.gitbooks.io/phoenix-doc-in-chinese/content/",
-                           "title": "Phoenix 框架中文文档"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Erlang",
-                     "entries": [
-                        {
-                           "url": "https://github.com/liancheng/cpie-cn",
-                           "title": "Erlang 并发编程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Fortran",
-                     "entries": [
-                        {
-                           "url": "http://micro.ustc.edu.cn/Fortran/ZJDing/",
-                           "title": "Fortran77和90/95编程入门"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Golang",
-                     "entries": [
-                        {
-                           "url": "http://go.ctolib.com/docs/read/magical-go-c-index.html",
-                           "title": "神奇的 Go 语言"
-                        },
-                        {
-                           "url": "http://mikespook.com/learning-go/",
-                           "title": "学习Go语言"
-                        },
-                        {
-                           "url": "https://github.com/Unknwon/go-fundamental-programming",
-                           "title": "Go 编程基础"
-                        },
-                        {
-                           "url": "https://github.com/golang-china/golangdoc.translations",
-                           "title": "Go 官方文档翻译"
-                        },
-                        {
-                           "url": "https://github.com/songleo/the-little-go-book_ZH_CN",
-                           "title": "Go 简易教程"
-                        },
-                        {
-                           "url": "https://github.com/Unknwon/the-way-to-go_ZH_CN",
-                           "title": "Go 入门指南"
-                        },
-                        {
-                           "url": "https://github.com/chai2010/go-ast-book",
-                           "title": "Go 语法树入门"
-                        },
-                        {
-                           "url": "https://github.com/polaris1119/The-Golang-Standard-Library-by-Example",
-                           "title": "Go 语言标准库"
-                        },
-                        {
-                           "url": "https://github.com/chai2010/advanced-go-programming-book",
-                           "title": "Go 语言高级编程（Advanced Go Programming）"
-                        },
-                        {
-                           "url": "https://github.com/rujews/go-in-action-notes",
-                           "title": "Go 语言实战笔记"
-                        },
-                        {
-                           "url": "https://tour.go-zh.org/list",
-                           "title": "Go 指南"
-                        },
-                        {
-                           "url": "https://github.com/astaxie/build-web-application-with-golang",
-                           "title": "Go Web 编程"
-                        },
-                        {
-                           "url": "https://github.com/hyper-carrot/go_command_tutorial",
-                           "title": "Go命令教程"
-                        },
-                        {
-                           "url": "https://github.com/astaxie/Go-in-Action",
-                           "title": "Go实战开发"
-                        },
-                        {
-                           "url": "https://github.com/achun/Go-Blog-In-Action",
-                           "title": "Go语言博客实践"
-                        },
-                        {
-                           "url": "http://blog.csdn.net/dc_726/article/details/46565241",
-                           "title": "Java程序员的Golang入门指南"
-                        },
-                        {
-                           "url": "https://github.com/astaxie/NPWG_zh",
-                           "title": "Network programming with Go 中文翻译版本"
-                        },
-                        {
-                           "url": "http://gorevel.cn/docs/manual/index.html",
-                           "title": "Revel 框架手册"
-                        },
-                        {
-                           "url": "https://github.com/kevingo/the-little-go-book",
-                           "title": "The Little Go Book 繁體中文翻譯版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Groovy",
-                     "entries": [
-                        {
-                           "url": "http://www.ibm.com/developerworks/cn/java/j-pg/",
-                           "title": "实战 Groovy 系列"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "https://learnyouahaskell.mno2.org",
-                           "title": "Haskell 趣学指南"
-                        },
-                        {
-                           "url": "http://cnhaskell.com",
-                           "title": "Real World Haskell 中文版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML / CSS",
-                     "entries": [
-                        {
-                           "url": "http://alloyteam.github.io/CodeGuide/",
-                           "title": "前端代码规范"
-                        },
-                        {
-                           "url": "https://github.com/chadluo/CSS-Guidelines/blob/master/README.md",
-                           "title": "通用 CSS 笔记、建议与指导"
-                        },
-                        {
-                           "url": "http://zh.learnlayout.com",
-                           "title": "学习CSS布局"
-                        },
-                        {
-                           "url": "https://bootstrap.hexschool.com",
-                           "title": "Bootstrap 4 繁體中文手冊"
-                        },
-                        {
-                           "url": "https://github.com/waylau/css3-tutorial",
-                           "title": "CSS3 Tutorial 《CSS3 教程》"
-                        },
-                        {
-                           "url": "http://css.doyoe.com",
-                           "title": "CSS参考手册"
-                        },
-                        {
-                           "url": "http://yanxyz.github.io/emmet-docs/",
-                           "title": "Emmet 文档"
-                        },
-                        {
-                           "url": "http://www.w3school.com.cn/html5/index.asp",
-                           "title": "HTML5 教程"
-                        },
-                        {
-                           "url": "http://codeguide.bootcss.com",
-                           "title": "HTML和CSS编码规范"
-                        },
-                        {
-                           "url": "http://sass-guidelin.es/zh/",
-                           "title": "Sass Guidelines 中文"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "iOS",
-                     "entries": [
-                        {
-                           "url": "https://github.com/jkyin/Subtitle",
-                           "title": "网易斯坦福大学公开课：iOS 7应用开发字幕文件"
-                        },
-                        {
-                           "url": "http://nilsun.github.io/apple-watch/",
-                           "title": "Apple Watch开发初探"
-                        },
-                        {
-                           "url": "http://zh-google-styleguide.readthedocs.org/en/latest/google-objc-styleguide/",
-                           "title": "Google Objective-C Style Guide 中文版"
-                        },
-                        {
-                           "url": "http://isux.tencent.com/ios-human-interface-guidelines-ui-design-basics-ios7.html",
-                           "title": "iOS7人机界面指南"
-                        },
-                        {
-                           "url": "https://github.com/qinjx/30min_guides/blob/master/ios.md",
-                           "title": "iOS开发60分钟入门"
-                        },
-                        {
-                           "url": "http://wileam.com/iphone-6-screen-cn/",
-                           "title": "iPhone 6 屏幕揭秘"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "https://github.com/alibaba/p3c/blob/master/Java%E5%BC%80%E5%8F%91%E6%89%8B%E5%86%8C%EF%BC%88%E5%B5%A9%E5%B1%B1%E7%89%88%EF%BC%89.pdf",
-                           "title": "阿里巴巴 Java 开发手册"
-                        },
-                        {
-                           "url": "https://github.com/waylau/RestDemo",
-                           "title": "用jersey构建REST服务"
-                        },
-                        {
-                           "url": "https://github.com/waylau/activiti-5.x-user-guide",
-                           "title": "Activiti 5.x 用户指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/apache-mina-2.x-user-guide",
-                           "title": "Apache MINA 2 用户指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/apache-shiro-1.2.x-reference",
-                           "title": "Apache Shiro 用户指南"
-                        },
-                        {
-                           "url": "http://hawstein.com/2014/01/20/google-java-style/",
-                           "title": "Google Java编程风格指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/h2-database-doc",
-                           "title": "H2 Database 教程"
-                        },
-                        {
-                           "url": "https://java.quanke.name",
-                           "title": "Java 编程思想"
-                        },
-                        {
-                           "url": "https://github.com/waylau/java-code-conventions",
-                           "title": "Java 编码规范"
-                        },
-                        {
-                           "url": "https://github.com/waylau/servlet-3.1-specification",
-                           "title": "Java Servlet 3.1 规范"
-                        },
-                        {
-                           "url": "https://github.com/waylau/Jersey-2.x-User-Guide",
-                           "title": "Jersey 2.x 用户指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/jsse-reference-guide",
-                           "title": "JSSE 参考指南"
-                        },
-                        {
-                           "url": "http://mybatis.github.io/mybatis-3/zh/index.html",
-                           "title": "MyBatis中文文档"
-                        },
-                        {
-                           "url": "https://github.com/waylau/netty-4-user-guide",
-                           "title": "Netty 4.x 用户指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/essential-netty-in-action",
-                           "title": "Netty 实战(精髓)"
-                        },
-                        {
-                           "url": "http://nutzbook.wendal.net",
-                           "title": "Nutz-book Nutz烹调向导"
-                        },
-                        {
-                           "url": "https://nutzam.com/core/nutz_preface.html",
-                           "title": "Nutz文档"
-                        },
-                        {
-                           "url": "https://github.com/waylau/rest-in-action",
-                           "title": "REST 实战"
-                        },
-                        {
-                           "url": "https://github.com/qibaoguang/Spring-Boot-Reference-Guide",
-                           "title": "Spring Boot参考指南"
-                        },
-                        {
-                           "url": "https://github.com/waylau/spring-framework-4-reference",
-                           "title": "Spring Framework 4.x参考文档"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://justjavac.com/named-function-expressions-demystified.html",
-                           "title": "命名函数表达式探秘"
-                        },
-                        {
-                           "url": "https://github.com/getify/You-Dont-Know-JS/tree/1ed-zh-CN",
-                           "title": "你不知道的Javascript"
-                        },
-                        {
-                           "url": "http://www.cnblogs.com/TomXu/archive/2011/12/15/2288411.html",
-                           "title": "深入理解JavaScript系列"
-                        },
-                        {
-                           "url": "http://www.oschina.net/translate/learning-javascript-design-patterns",
-                           "title": "学用 JavaScript 设计模式"
-                        },
-                        {
-                           "url": "https://github.com/adamlu/javascript-style-guide",
-                           "title": "Airbnb JavaScript 规范"
-                        },
-                        {
-                           "url": "http://es6.ruanyifeng.com",
-                           "title": "ECMAScript 6 入门"
-                        },
-                        {
-                           "url": "http://bq69.com/blog/articles/script/868/google-javascript-style-guide.html",
-                           "title": "Google JavaScript 代码风格指南"
-                        },
-                        {
-                           "url": "http://javascript.ruanyifeng.com",
-                           "title": "JavaScript 标准参考教程（alpha）"
-                        },
-                        {
-                           "url": "https://github.com/justjavac/12-javascript-quirks",
-                           "title": "javascript 的 12 个怪癖"
-                        },
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/zh/",
-                           "title": "JavaScript 秘密花园"
-                        },
-                        {
-                           "url": "https://github.com/jayli/javascript-patterns",
-                           "title": "《JavaScript 模式》"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170112164945/http://typeof.net/s/jsmech/",
-                           "title": "Javascript 原理"
-                        },
-                        {
-                           "url": "http://liubin.github.io/promises-book/",
-                           "title": "JavaScript Promise迷你书"
-                        },
-                        {
-                           "url": "http://pij.robinqu.me",
-                           "title": "Javascript编程指南"
-                        },
-                        {
-                           "url": "http://icodeit.org/jsccp/",
-                           "title": "JavaScript核心概念及实践"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/xufei/Make-Your-Own-AngularJS/blob/master/01.md",
-                                 "title": "构建自己的AngularJS"
-                              },
-                              {
-                                 "url": "http://www.waylau.com/build-angularjs-app-with-yeoman-in-windows/",
-                                 "title": "在Windows环境下用Yeoman构建AngularJS项目"
-                              },
-                              {
-                                 "url": "https://github.com/zensh/AngularjsTutorial_cn",
-                                 "title": "AngularJS入门教程"
-                              },
-                              {
-                                 "url": "https://github.com/mgechev/angularjs-style-guide/blob/master/README-zh-cn.md",
-                                 "title": "AngularJS最佳实践和风格指南"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Backbone.js",
-                           "entries": [
-                              {
-                                 "url": "http://www.the5fire.com/backbone-js-tutorials-pdf-download.html",
-                                 "title": "Backbone.js入门教程"
-                              },
-                              {
-                                 "url": "https://github.com/the5fire/backbonejs-learning-note",
-                                 "title": "Backbone.js入门教程第二版"
-                              },
-                              {
-                                 "url": "http://www.css88.com/doc/backbone/",
-                                 "title": "Backbone.js中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "D3.js",
-                           "entries": [
-                              {
-                                 "url": "http://www.cnblogs.com/winleisure/tag/D3.js/",
-                                 "title": "楚狂人的D3教程"
-                              },
-                              {
-                                 "url": "https://github.com/mbostock/d3/wiki/API--%E4%B8%AD%E6%96%87%E6%89%8B%E5%86%8C",
-                                 "title": "官方API文档"
-                              },
-                              {
-                                 "url": "http://blog.csdn.net/zhang__tianxu/article/category/1623437",
-                                 "title": "张天旭的D3教程"
-                              },
-                              {
-                                 "url": "http://d3.decembercafe.org",
-                                 "title": "Learning D3.JS"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Electron.js",
-                           "entries": [
-                              {
-                                 "url": "https://wizardforcel.gitbooks.io/electron-doc/content",
-                                 "title": "Electron 中文文档"
-                              },
-                              {
-                                 "url": "https://www.w3cschool.cn/electronmanual",
-                                 "title": "Electron 中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "ExtJS",
-                           "entries": [
-                              {
-                                 "url": "http://extjs-doc-cn.github.io/ext4api/",
-                                 "title": "Ext4.1.0 中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "impress.js",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/kokdemo/impress.js-tutorial-in-Chinese",
-                                 "title": "impress.js的中文教程"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "jQuery",
-                           "entries": [
-                              {
-                                 "url": "http://www.nowamagic.net/librarys/books/contents/jquery",
-                                 "title": "简单易懂的JQuery魔法"
-                              },
-                              {
-                                 "url": "http://i5ting.github.io/How-to-write-jQuery-plugin/build/jquery.plugin.html",
-                                 "title": "How to write jQuery plugin"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "http://nqdeng.github.io/7-days-nodejs/",
-                                 "title": "七天学会NodeJS"
-                              },
-                              {
-                                 "url": "https://github.com/nswbmw/N-blog",
-                                 "title": "使用 Express + MongoDB 搭建多人博客"
-                              },
-                              {
-                                 "url": "http://expressjs.jser.us",
-                                 "title": "express.js 中文文档"
-                              },
-                              {
-                                 "url": "http://javascript.ruanyifeng.com/nodejs/express.html",
-                                 "title": "Express框架"
-                              },
-                              {
-                                 "url": "http://nodejs.ctolib.com/docs/sfile/jstraining/engineering.html",
-                                 "title": "JavaScript全栈工程师培训材料"
-                              },
-                              {
-                                 "url": "https://github.com/guo-yu/koa-guide",
-                                 "title": "koa 中文文档"
-                              },
-                              {
-                                 "url": "https://www.npmjs.com/package/learnyounode-zh-cn",
-                                 "title": "Learn You The Node.js For Much Win! (中文版)"
-                              },
-                              {
-                                 "url": "http://i5ting.github.io/node-debug-tutorial/",
-                                 "title": "Node debug 三法三例"
-                              },
-                              {
-                                 "url": "https://github.com/alsotang/node-lessons",
-                                 "title": "Node.js 包教不包会"
-                              },
-                              {
-                                 "url": "https://github.com/jollen/nodejs-fullstack-lessons",
-                                 "title": "Node.js Fullstack《從零到一的進撃》"
-                              },
-                              {
-                                 "url": "http://www.nodebeginner.org/index-zh-cn.html",
-                                 "title": "Node入门"
-                              },
-                              {
-                                 "url": "https://github.com/nodejs-tw/nodejs-wiki-book",
-                                 "title": "Nodejs Wiki Book"
-                              },
-                              {
-                                 "url": "https://www.gitbook.com/book/0532/nodejs/details",
-                                 "title": "nodejs中文文档"
-                              },
-                              {
-                                 "url": "https://www.gitbook.com/book/0532/nodejs/details",
-                                 "title": "The NodeJS 中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React.js",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/theJian/build-a-hn-front-page",
-                                 "title": "Learn React & Webpack by building the Hacker News front page"
-                              },
-                              {
-                                 "url": "https://github.com/hateonion/react-bits-CN",
-                                 "title": "React-Bits 中文文档"
-                              },
-                              {
-                                 "url": "http://wiki.jikexueyuan.com/project/react-native/",
-                                 "title": "React Native 中文文档(含最新Android内容)"
-                              },
-                              {
-                                 "url": "https://github.com/fakefish/react-webpack-cookbook",
-                                 "title": "React webpack-cookbook"
-                              },
-                              {
-                                 "url": "http://fraserxu.me/intro-to-react/",
-                                 "title": "React.js 入门教程"
-                              },
-                              {
-                                 "url": "https://discountry.github.io/react/",
-                                 "title": "React.js 中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Vue.js",
-                           "entries": [
-                              {
-                                 "url": "https://cn.vuejs.org/v2/guide/",
-                                 "title": "Vue.js中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Zepto.js",
-                           "entries": [
-                              {
-                                 "url": "http://css88.com/doc/zeptojs_api",
-                                 "title": "Zepto.js 中文文档"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "LaTeX",
-                     "entries": [
-                        {
-                           "url": "https://github.com/49951331/graduate-project-102pj/blob/master/docs/latex123.pdf",
-                           "title": "大家來學 LaTeX"
-                        },
-                        {
-                           "url": "http://ctan.org/pkg/lshort-zh-cn",
-                           "title": "一份不太简短的 LaTeX2ε 介绍"
-                        },
-                        {
-                           "url": "http://www.dralpha.com/zh/tech/tech.htm",
-                           "title": "LaTeX 笔记"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LISP",
-                     "entries": [
-                        {
-                           "url": "http://acl.readthedocs.org/en/latest/",
-                           "title": "ANSI Common Lisp 中文翻译版"
-                        },
-                        {
-                           "url": "http://www.ituring.com.cn/minibook/862",
-                           "title": "Common Lisp 高级编程技术"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lua",
-                     "entries": [
-                        {
-                           "url": "http://www.w3cschool.cc/manual/lua53doc/contents.html",
-                           "title": "Lua 5.3 参考手册"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Markdown",
-                     "entries": [
-                        {
-                           "url": "http://www.jianshu.com/p/q81RER",
-                           "title": "献给写作者的 Markdown 新手指南"
-                        },
-                        {
-                           "url": "https://markdown.tw",
-                           "title": "Markdown 語法說明"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "http://www.cnblogs.com/mr-wid/archive/2013/05/09/3068229.html",
-                           "title": "21分钟MySQL入门教程"
-                        },
-                        {
-                           "url": "http://blog.codinglabs.org/articles/theory-of-mysql-index.html",
-                           "title": "MySQL索引背后的数据结构及算法原理"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "NoSQL",
-                     "entries": [
-                        {
-                           "url": "https://github.com/huangz1990/annotated_redis_source",
-                           "title": "带有详细注释的 Redis 2.6 代码"
-                        },
-                        {
-                           "url": "https://github.com/huangz1990/redis-3.0-annotated",
-                           "title": "带有详细注释的 Redis 3.0 代码"
-                        },
-                        {
-                           "url": "http://disque.huangz.me",
-                           "title": "Disque 使用教程"
-                        },
-                        {
-                           "url": "http://redisdoc.com",
-                           "title": "Redis 命令参考"
-                        },
-                        {
-                           "url": "http://redisbook.com",
-                           "title": "Redis 设计与实现"
-                        },
-                        {
-                           "url": "https://github.com/justinyhuang/the-little-mongodb-book-cn/blob/master/mongodb.md",
-                           "title": "The Little MongoDB Book"
-                        },
-                        {
-                           "url": "https://github.com/JasonLai256/the-little-redis-book/blob/master/cn/redis.md",
-                           "title": "The Little Redis Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "https://github.com/fayland/chinese-perl-book",
-                           "title": "Master Perl Today"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20150326073235/http://net.pku.edu.cn/~yhf/tutorial/perl/perl.html",
-                           "title": "Perl 5 教程"
-                        },
-                        {
-                           "url": "http://www.yiibai.com/perl",
-                           "title": "Perl 教程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "http://www.php-internals.com/book/",
-                           "title": "深入理解 PHP 内核"
-                        },
-                        {
-                           "url": "https://codeigniter.org.tw/userguide3",
-                           "title": "CodeIgniter 使用手冊"
-                        },
-                        {
-                           "url": "http://docs.phpcomposer.com",
-                           "title": "Composer中文文档"
-                        },
-                        {
-                           "url": "http://www.myleftstudio.com",
-                           "title": "Phalcon7中文文档"
-                        },
-                        {
-                           "url": "http://wulijun.github.io/php-the-right-way/",
-                           "title": "PHP 之道"
-                        },
-                        {
-                           "url": "https://psr.phphub.org",
-                           "title": "PHP标准规范中文版"
-                        },
-                        {
-                           "url": "http://php.net/manual/zh/",
-                           "title": "PHP中文手册"
-                        },
-                        {
-                           "url": "http://www.yiichina.com/doc/guide/2.0",
-                           "title": "Yii2中文文档"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Laravel",
-                           "entries": [
-                              {
-                                 "url": "http://d.laravel-china.org/docs/5.4",
-                                 "title": "Laravel 5.4 中文文档"
-                              },
-                              {
-                                 "url": "https://learnku.com/docs/laravel/6.x",
-                                 "title": "Laravel 6 中文文档"
-                              },
-                              {
-                                 "url": "https://learnku.com/docs/laravel/7.x",
-                                 "title": "Laravel 7 中文文档"
-                              },
-                              {
-                                 "url": "https://learnku.com/docs/laravel/8.x",
-                                 "title": "Laravel 8 中文文档"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://wusuopu.gitbooks.io/symfony2_tutorial/content",
-                                 "title": "Symfony 2 实例教程"
-                              },
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/zh_CN/index.html",
-                                 "title": "Symfony 5 快速开发"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "PostgreSQL",
-                     "entries": [
-                        {
-                           "url": "http://works.jinbuguo.com/postgresql/menu823/index.html",
-                           "title": "PostgreSQL 8.2.3 中文文档"
-                        },
-                        {
-                           "url": "http://www.postgres.cn/docs/9.3/index.html",
-                           "title": "PostgreSQL 9.3.1 中文文档"
-                        },
-                        {
-                           "url": "http://www.postgres.cn/docs/9.4/index.html",
-                           "title": "PostgreSQL 9.4.4 中文文档"
-                        },
-                        {
-                           "url": "http://www.postgres.cn/docs/9.5/index.html",
-                           "title": "PostgreSQL 9.5.3 中文文档"
-                        },
-                        {
-                           "url": "http://www.postgres.cn/docs/9.6/index.html",
-                           "title": "PostgreSQL 9.6.0 中文文档"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://bop.molun.net",
-                           "title": "简明 Python 教程"
-                        },
-                        {
-                           "url": "https://www.cnblogs.com/derek1184405959/p/8579428.html",
-                           "title": "人生苦短，我用python"
-                        },
-                        {
-                           "url": "https://github.com/jiechic/diveintopython3",
-                           "title": "深入 Python 3"
-                        },
-                        {
-                           "url": "https://www.ctolib.com/docs/sfile/think-python-2e/0.html",
-                           "title": "像计算机科学家一样思考Python"
-                        },
-                        {
-                           "url": "http://www.osgeo.cn/matplotlib/",
-                           "title": "Matplotlib 3.0.3 中文文档"
-                        },
-                        {
-                           "url": "http://www.osgeo.cn/numpy/",
-                           "title": "Numpy 1.16 中文文档"
-                        },
-                        {
-                           "url": "http://docspy3zh.readthedocs.org/en/latest/",
-                           "title": "Python 3 文档(简体中文) 3.2.2 documentation"
-                        },
-                        {
-                           "url": "http://www.osgeo.cn/cpython/",
-                           "title": "Python 3.8.0a3中文文档"
-                        },
-                        {
-                           "url": "http://www.pythondoc.com",
-                           "title": "Python 中文学习大本营"
-                        },
-                        {
-                           "url": "https://pythonguidecn.readthedocs.io/zh/latest/",
-                           "title": "Python 最佳实践指南"
-                        },
-                        {
-                           "url": "http://python3-cookbook.readthedocs.io/zh_CN/latest/",
-                           "title": "Python Cookbook第三版"
-                        },
-                        {
-                           "url": "http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000",
-                           "title": "Python教程 - 廖雪峰的官方网站"
-                        },
-                        {
-                           "url": "https://interpy.eastlakeside.com",
-                           "title": "Python进阶"
-                        },
-                        {
-                           "url": "http://funhacks.net/explore-python",
-                           "title": "Python之旅"
-                        },
-                        {
-                           "url": "http://www.osgeo.cn/tornado/",
-                           "title": "Tornado 6.1 中文文档"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://www.yiyibooks.cn/xx/Django_1.11.6/index.html",
-                                 "title": "Django 1.11.6 中文文档"
-                              },
-                              {
-                                 "url": "http://www.osgeo.cn/django/",
-                                 "title": "Django 2.2.1 中文文档"
-                              },
-                              {
-                                 "url": "https://www.dusaiphoto.com/article/detail/2",
-                                 "title": "Django 搭建个人博客教程 (2.1)"
-                              },
-                              {
-                                 "url": "http://djangobook.py3k.cn/2.0/",
-                                 "title": "Django book 2.0"
-                              },
-                              {
-                                 "url": "https://tutorial.djangogirls.org/zh/",
-                                 "title": "Django Girls 教程 (1.11)"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Liu-FAQ.pdf",
-                           "title": "153分钟学会 R"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Xu-Statistics_and_R.pdf",
-                           "title": "统计学与 R 读书笔记"
-                        },
-                        {
-                           "url": "http://yanping.me/shiny-tutorial/",
-                           "title": "用 R 构建 Shiny 应用程序"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Ding-R-intro_cn.pdf",
-                           "title": "R 导论"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "reStructuredText",
-                     "entries": [
-                        {
-                           "url": "http://www.pythondoc.com/sphinx/rest.html",
-                           "title": "reStructuredText 入门"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "http://lrthw.github.io",
-                           "title": "笨方法学 Ruby"
-                        },
-                        {
-                           "url": "https://github.com/JuanitoFatas/rails-style-guide/blob/master/README-zhCN.md",
-                           "title": "Rails 风格指南"
-                        },
-                        {
-                           "url": "https://github.com/JuanitoFatas/ruby-style-guide/blob/master/README-zhCN.md",
-                           "title": "Ruby 风格指南"
-                        },
-                        {
-                           "url": "https://ihower.tw/rails4/",
-                           "title": "Ruby on Rails 实战圣经"
-                        },
-                        {
-                           "url": "http://guides.ruby-china.org",
-                           "title": "Ruby on Rails 指南"
-                        },
-                        {
-                           "url": "http://www.sinatrarb.com/intro-zh.html",
-                           "title": "Sinatra"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Rust",
-                     "entries": [
-                        {
-                           "url": "https://github.com/rustcc/rust-by-example/",
-                           "title": "通过例子学习 Rust"
-                        },
-                        {
-                           "url": "https://github.com/KaiserY/rust-book-chinese",
-                           "title": "Rust 官方教程"
-                        },
-                        {
-                           "url": "https://github.com/photino/rust-notes",
-                           "title": "Rust 语言学习笔记"
-                        },
-                        {
-                           "url": "https://github.com/rustcc/RustPrimer",
-                           "title": "RustPrimer"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scala",
-                     "entries": [
-                        {
-                           "url": "http://twitter.github.io/effectivescala/index-cn.html",
-                           "title": "Effective Scala"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/windor/beginners-guide-to-scala/details",
-                           "title": "Scala 初学者指南"
-                        },
-                        {
-                           "url": "http://twitter.github.io/scala_school/zh_cn/index.html",
-                           "title": "Scala 课堂"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scheme",
-                     "entries": [
-                        {
-                           "url": "http://deathking.github.io/yast-cn/",
-                           "title": "Scheme 入门教程"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "http://cccgchinese.strikingly.com",
-                           "title": "创意计算课程指南"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Shell",
-                     "entries": [
-                        {
-                           "url": "https://tinylab.gitbooks.io/shellbook/content",
-                           "title": "Shell 编程范例"
-                        },
-                        {
-                           "url": "http://wiki.ubuntu.org.cn/Shell%E7%BC%96%E7%A8%8B%E5%9F%BA%E7%A1%80",
-                           "title": "Shell 编程基础"
-                        },
-                        {
-                           "url": "https://github.com/qinjx/30min_guides/blob/master/shell.md",
-                           "title": "Shell 脚本编程30分钟入门"
-                        },
-                        {
-                           "url": "http://me.52fhy.com/shell-book/",
-                           "title": "shell-book"
-                        },
-                        {
-                           "url": "http://billie66.github.io/TLCL/book/",
-                           "title": "The Linux Command Line 中文版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Swift",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/numbbbbb/-the-swift-programming-language-/details",
-                           "title": "《The Swift Programming Language》中文版"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://www.runoob.com/typescript/ts-tutorial.html",
-                           "title": "TypeScript 教程"
-                        },
-                        {
-                           "url": "https://www.runoob.com/w3cnote/getting-started-with-typescript.html",
-                           "title": "TypeScript 入门教程"
-                        },
-                        {
-                           "url": "https://www.tslang.cn",
-                           "title": "TypeScript 中文网"
-                        },
-                        {
-                           "url": "https://github.com/jkchao/typescript-book-chinese",
-                           "title": "TypeScript Deep Dive 中文版"
-                        },
-                        {
-                           "url": "https://www.runoob.com/manual/gitbook/TypeScript/_book/",
-                           "title": "TypeScript Handbook（中文版）"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://angular.cn/docs",
-                                 "title": "Angular 文档简介"
-                              },
-                              {
-                                 "url": "https://material.angular.cn",
-                                 "title": "Angular Material 组件库"
-                              },
-                              {
-                                 "url": "https://angular.cn/tutorial",
-                                 "title": "Angular Tutorial (教程：英雄之旅)"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Deno",
-                           "entries": [
-                              {
-                                 "url": "https://deno-tutorial.js.org",
-                                 "title": "Deno 钻研之术"
-                              },
-                              {
-                                 "url": "https://chenshenhai.com/deno_note",
-                                 "title": "Deno进阶开发笔记"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "VBA (Microsoft Visual Basic Applications)",
-                     "entries": [
-                        {
-                           "url": "https://github.com/Youchien/concise-excel-vba",
-                           "title": "简明Excel VBA"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Vim",
-                     "entries": [
-                        {
-                           "url": "http://www.study-area.org/tips/vim/index.html",
-                           "title": "大家來學 VIM"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Visual Prolog",
-                     "entries": [
-                        {
-                           "url": "http://wiki.visual-prolog.com/index.php?title=Visual_Prolog_for_Tyros_in_Chinese",
-                           "title": "Visual Prolog 7边练边学"
-                        },
-                        {
-                           "url": "http://wiki.visual-prolog.com/index.php?title=A_Beginners_Guide_to_Visual_Prolog_in_Chinese",
-                           "title": "Visual Prolog 7初学指南"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "WebAssembly",
-                     "entries": [
-                        {
-                           "url": "https://github.com/3dgen/cppwasm-book",
-                           "title": "C/C++面向WebAssembly编程"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            },
-            {
-               "language": {
-                  "code": "en-US",
-                  "name": "English"
-               },
-               "index": {},
-               "sections": [
-                  {
-                     "section": "0 - Meta-Lists",
-                     "entries": [
-                        {
-                           "url": "http://www.atariarchives.org",
-                           "title": "atariarchives.org"
-                        },
-                        {
-                           "url": "https://www.bento.io",
-                           "title": "Bento"
-                        },
-                        {
-                           "url": "http://bitsavers.trailing-edge.com",
-                           "title": "Bitsavers.org"
-                        },
-                        {
-                           "url": "http://bookboon.com/en/it-programming-ebooks",
-                           "title": "Bookboon: IT & Programming"
-                        },
-                        {
-                           "url": "https://codecatalog.org",
-                           "title": "Code Catalog: A Collection of Code Examples from Prominent Open Source Projects"
-                        },
-                        {
-                           "url": "http://conceptf1.blogspot.com/2013/11/list-of-freely-available-programming.html",
-                           "title": "conceptf1.blogspot.com"
-                        },
-                        {
-                           "url": "http://stephane.ducasse.free.fr/FreeBooks.html",
-                           "title": "Free Smalltalk Books, collected by Stéphane Ducasse"
-                        },
-                        {
-                           "url": "http://www.freetechbooks.com",
-                           "title": "Free Tech Books"
-                        },
-                        {
-                           "url": "https://goalkicker.com",
-                           "title": "Goalkicker"
-                        },
-                        {
-                           "url": "http://www.redbooks.ibm.com",
-                           "title": "IBM Redbooks"
-                        },
-                        {
-                           "url": "http://www.infoq.com/minibooks/",
-                           "title": "InfoQ Minibooks"
-                        },
-                        {
-                           "url": "http://www.intechopen.com/subjects/computer-and-information-science",
-                           "title": "InTech: Computer and Information Science"
-                        },
-                        {
-                           "url": "https://github.com/revolunet/JSbooks",
-                           "title": "JSBooks - directory of free javascript ebooks"
-                        },
-                        {
-                           "url": "https://learnxinyminutes.com",
-                           "title": "Learn X in Y minutes"
-                        },
-                        {
-                           "url": "https://www.learneroo.com/modules/12/nodes/96",
-                           "title": "Learneroo Resources to Learn Programming"
-                        },
-                        {
-                           "url": "https://blogs.msdn.microsoft.com/mssmallbiz/2014/07/07/largest-collection-of-free-microsoft-ebooks-ever-including-windows-8-1-windows-8-windows-7-office-2013-office-365-office-2010-sharepoint-2013-dynamics-crm-powershell-exchange-server-lync-2/",
-                           "title": "Microsoft Guides to Software"
-                        },
-                        {
-                           "url": "https://mva.microsoft.com/ebooks",
-                           "title": "Microsoft Press: Free E-Books"
-                        },
-                        {
-                           "url": "https://blogs.msdn.microsoft.com/mssmallbiz/2012/07/27/large-collection-of-free-microsoft-ebooks-for-you-including-sharepoint-visual-studio-windows-phone-windows-8-office-365-office-2010-sql-server-2012-azure-and-more/",
-                           "title": "Microsoft Technologies 1, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, Office365, etc. collection by Eric Ligman"
-                        },
-                        {
-                           "url": "https://blogs.msdn.microsoft.com/mssmallbiz/2012/07/30/another-large-collection-of-free-microsoft-ebooks-and-resource-kits-for-you-including-sharepoint-2013-office-2013-office-365-duet-2-0-azure-cloud-windows-phone-lync-dynamics-crm-and-more/",
-                           "title": "Microsoft Technologies 2, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, etc. collection by Eric Ligman"
-                        },
-                        {
-                           "url": "http://www.oreilly.com/openbook/",
-                           "title": "O'Reilly's Open Books Project"
-                        },
-                        {
-                           "url": "https://github.com/papers-we-love/papers-we-love",
-                           "title": "Papers we love"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Category%3aComputer_programming",
-                           "title": "Programming"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/index",
-                           "title": "Red Gate Books"
-                        },
-                        {
-                           "url": "http://stephane.ducasse.free.fr/FreeBooks/",
-                           "title": "Stef's Free Online Smalltalk Books"
-                        },
-                        {
-                           "url": "http://www.techbeamers.com",
-                           "title": "TechBeamers.com"
-                        },
-                        {
-                           "url": "http://www.techbooksforfree.com",
-                           "title": "TechBooksForFree.com"
-                        },
-                        {
-                           "url": "http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list",
-                           "title": "The Definitive C++ Book Guide and List"
-                        },
-                        {
-                           "url": "http://theassayer.org",
-                           "title": "Theassayer.org"
-                        },
-                        {
-                           "url": "http://www.tutorialspoint.com",
-                           "title": "tutorialspoint"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Graphics Programming",
-                     "entries": [
-                        {
-                           "url": "https://github.com/lettier/3d-game-shaders-for-beginners",
-                           "title": "3D Game Shaders For Beginners"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Blender_3D%3A_Noob_to_Pro",
-                           "title": "Blender 3D: Noob to Pro"
-                        },
-                        {
-                           "url": "https://docs.blender.org/manual/en/latest",
-                           "title": "Blender Manual"
-                        },
-                        {
-                           "url": "http://gabrielgambetta.com/computer-graphics-from-scratch",
-                           "title": "Computer Graphics from scratch"
-                        },
-                        {
-                           "url": "http://user.xmission.com/~legalize/book/download/index.html",
-                           "title": "DirectX manual"
-                        },
-                        {
-                           "url": "https://developer.nvidia.com/gpugems/GPUGems/gpugems_pref01.html",
-                           "title": "GPU Gems"
-                        },
-                        {
-                           "url": "http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/graphics-programming-black-book-r1698",
-                           "title": "Graphics Programming Black Book"
-                        },
-                        {
-                           "url": "https://open.gl",
-                           "title": "Introduction to Modern OpenGL"
-                        },
-                        {
-                           "url": "https://leanpub.com/introductiontotouchdesigner/",
-                           "title": "Introduction to TouchDesigner 099"
-                        },
-                        {
-                           "url": "https://www.scratchapixel.com",
-                           "title": "Learn Computer Graphics From Scratch!"
-                        },
-                        {
-                           "url": "http://learnopengl.com",
-                           "title": "Learn OpenGL"
-                        },
-                        {
-                           "url": "https://github.com/bwasty/learn-opengl-rs",
-                           "title": "Learn OpenGL RS"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20150225192611/http://www.arcsynthesis.org/gltut/index.html",
-                           "title": "Learning Modern 3D Graphics Programming"
-                        },
-                        {
-                           "url": "https://www.cs.csustan.edu/~rsc/CS3600F00/Notes.pdf",
-                           "title": "Notes for a Computer Graphics Programming Course"
-                        },
-                        {
-                           "url": "http://www.songho.ca/opengl/index.html",
-                           "title": "OpenGL"
-                        },
-                        {
-                           "url": "https://raytracing.github.io",
-                           "title": "Ray Tracing in One Weekend"
-                        },
-                        {
-                           "url": "http://www.realtimerendering.com/resources/shaderx/",
-                           "title": "ShaderX series"
-                        },
-                        {
-                           "url": "http://www.opengl-tutorial.org",
-                           "title": "Tutorials for modern OpenGL"
-                        },
-                        {
-                           "url": "http://webglinsights.com",
-                           "title": "WebGL Insights"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Vulkan",
-                           "entries": [
-                              {
-                                 "url": "https://vulkan-tutorial.com",
-                                 "title": "Vulkan Tutorial"
-                              },
-                              {
-                                 "url": "https://github.com/Naitsirc98/Vulkan-Tutorial-Java",
-                                 "title": "Vulkan Tutorial Java"
-                              },
-                              {
-                                 "url": "https://github.com/bwasty/vulkan-tutorial-rs",
-                                 "title": "Vulkan Tutorial RS"
-                              },
-                              {
-                                 "url": "https://vulkano.rs/guide/introduction",
-                                 "title": "Vulkano"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Graphical User Interfaces",
-                     "entries": [
-                        {
-                           "url": "https://developer.gnome.org/gtkmm-tutorial/stable/",
-                           "title": "Programming with gtkmm 4"
-                        },
-                        {
-                           "url": "http://searchuserinterfaces.com/book/",
-                           "title": "Search User Interfaces"
-                        },
-                        {
-                           "url": "https://people.gnome.org/~swilmet/glib-gtk-dev-platform.pdf",
-                           "title": "The GLib/GTK+ Development Platform"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "GraphQL",
-                     "entries": [
-                        {
-                           "url": "https://github.com/GraphQLCollege/fullstack-graphql",
-                           "title": "Fullstack GraphQL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Language Agnostic",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Algorithms & Data Structures",
-                           "entries": [
-                              {
-                                 "url": "https://web.archive.org/web/20191020195105/http://www0.cs.ucl.ac.uk/staff/W.Langdon/ftp/papers/poli08_fieldguide.pdf",
-                                 "title": "A Field Guide To Genetic Programming"
-                              },
-                              {
-                                 "url": "https://archive.org/details/AlgorithmDesign1stEditionByJonKleinbergAndEvaTardos2005PDF",
-                                 "title": "Algorithm Design"
-                              },
-                              {
-                                 "url": "http://code.google.com/p/graphbook/",
-                                 "title": "Algorithmic Graph Theory"
-                              },
-                              {
-                                 "url": "https://en.wikibooks.org/wiki/Algorithms",
-                                 "title": "Algorithms"
-                              },
-                              {
-                                 "url": "http://algs4.cs.princeton.edu/home/",
-                                 "title": "Algorithms, 4th Edition"
-                              },
-                              {
-                                 "url": "https://archive.org/details/Algorithms_And_Automatic_Computing_Machines",
-                                 "title": "Algorithms and Automatic Computing Machines (1963)"
-                              },
-                              {
-                                 "url": "https://www.math.upenn.edu/~wilf/AlgoComp.pdf",
-                                 "title": "Algorithms and Complexity"
-                              },
-                              {
-                                 "url": "http://jeffe.cs.illinois.edu/teaching/algorithms/",
-                                 "title": "Algorithms Course Materials"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/AlgorithmsBook",
-                                 "title": "Algorithms Notes for Professionals"
-                              },
-                              {
-                                 "url": "http://www.cse.iitd.ernet.in/~ssen/csl356/admin356.html",
-                                 "title": "Analysis and Design of Algorithms"
-                              },
-                              {
-                                 "url": "http://visualgo.net",
-                                 "title": "Animated Algorithm and Data Structure Visualization"
-                              },
-                              {
-                                 "url": "https://github.com/mdipierro/nlib",
-                                 "title": "Annotated Algorithms in Python: Applications in Physics, Biology, and Finance"
-                              },
-                              {
-                                 "url": "http://cslibrary.stanford.edu/110/BinaryTrees.pdf",
-                                 "title": "Binary Trees"
-                              },
-                              {
-                                 "url": "http://www.cse.iitd.ernet.in/~suban/cs130/index.html",
-                                 "title": "Data Structures"
-                              },
-                              {
-                                 "url": "http://www-inst.eecs.berkeley.edu/~cs61b/fa14/book2/data-structures.pdf",
-                                 "title": "Data Structures (Into Java) - Paul N. Hilfinger"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20170715160229/http://dotnetslackers.com/Community/files/folders/data-structures-and-algorithms/entry30283.aspx",
-                                 "title": "Data Structures and Algorithms: Annotated Reference with Examples"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/ebooks/datastructurespart1",
-                                 "title": "Data Structures Succinctly Part 1, Syncfusion"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/ebooks/datastructurespart2",
-                                 "title": "Data Structures Succinctly Part 2, Syncfusion"
-                              },
-                              {
-                                 "url": "https://github.com/liuxinyu95/AlgoXY",
-                                 "title": "Elementary Algorithms"
-                              },
-                              {
-                                 "url": "http://infolab.stanford.edu/~ullman/focs.html",
-                                 "title": "Foundations of Computer Science"
-                              },
-                              {
-                                 "url": "http://geomalgorithms.com",
-                                 "title": "Geometry Algorithms"
-                              },
-                              {
-                                 "url": "http://ianparberry.com/books/free/license.html",
-                                 "title": "Lectures Notes on Algorithm Analysis and Computational Complexity (Fourth Edition)"
-                              },
-                              {
-                                 "url": "http://people.mpi-inf.mpg.de/~mehlhorn/LEDAbook.html",
-                                 "title": "LEDA: A Platform for Combinatorial and Geometric Computing"
-                              },
-                              {
-                                 "url": "http://cslibrary.stanford.edu/103/LinkedListBasics.pdf",
-                                 "title": "Linked List Basics"
-                              },
-                              {
-                                 "url": "http://cslibrary.stanford.edu/105/LinkedListProblems.pdf",
-                                 "title": "Linked List Problems"
-                              },
-                              {
-                                 "url": "http://www.jjj.de/fxt/fxtbook.pdf",
-                                 "title": "Matters Computational: Ideas, Algorithms, Source Code"
-                              },
-                              {
-                                 "url": "http://opendatastructures.org",
-                                 "title": "Open Data Structures: An Introduction"
-                              },
-                              {
-                                 "url": "http://planning.cs.uiuc.edu",
-                                 "title": "Planning Algorithms"
-                              },
-                              {
-                                 "url": "http://ianparberry.com/books/free/license.html",
-                                 "title": "Problems on Algorithms (Second Edition)"
-                              },
-                              {
-                                 "url": "http://www.cs.cmu.edu/~rwh/theses/okasaki.pdf",
-                                 "title": "Purely Functional Data Structures (1996)"
-                              },
-                              {
-                                 "url": "http://www.inf.fh-flensburg.de/lang/algorithmen/sortieren/algoen.htm",
-                                 "title": "Sequential and parallel sorting algorithms"
-                              },
-                              {
-                                 "url": "http://igm.univ-mlv.fr/~mac/REC/text-algorithms.pdf",
-                                 "title": "Text Algorithms"
-                              },
-                              {
-                                 "url": "http://www8.cs.umu.se/kurser/TDBAfl/VT06/algorithms/BOOK/BOOK/BOOK.HTM",
-                                 "title": "The Algorithm Design Manual"
-                              },
-                              {
-                                 "url": "http://www.cs.utsa.edu/~wagner/knuth/",
-                                 "title": "The Art of Computer Programming"
-                              },
-                              {
-                                 "url": "http://www.designofapproxalgs.com/book.pdf",
-                                 "title": "The Design of Approximation Algorithms"
-                              },
-                              {
-                                 "url": "http://cslibrary.stanford.edu/109/TreeListRecursion.pdf",
-                                 "title": "The Great Tree List Recursion Problem"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/kademlia_protocol_succinctly",
-                                 "title": "The Kademlia Protocol Succinctly"
-                              },
-                              {
-                                 "url": "https://greenteapress.com/wp/think-complexity-2e/",
-                                 "title": "Think Complexity"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Artificial Intelligence",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/correll/Introduction-to-Autonomous-Robots/releases",
-                                 "title": "Introduction to Autonomous Robots"
-                              },
-                              {
-                                 "url": "http://ai.stanford.edu/~nilsson/QAI/qai.pdf",
-                                 "title": "The Quest for Artificial Intelligence: A History of Ideas and Achievements"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Cellular Automata",
-                           "entries": [
-                              {
-                                 "url": "https://www.wolframscience.com/nksonline/toc.html",
-                                 "title": "A New Kind of Science"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Cloud Computing",
-                           "entries": [
-                              {
-                                 "url": "https://docs.aws.amazon.com/wellarchitected/latest/framework",
-                                 "title": "AWS Well-Architected Framework"
-                              },
-                              {
-                                 "url": "https://azure.microsoft.com/en-us/resources/azure-for-architects/",
-                                 "title": "Azure for Architects, Third Edition"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/azure-functions-succinctly",
-                                 "title": "Azure Functions Succinctly, Syncfusion"
-                              },
-                              {
-                                 "url": "https://cloud4scieng.org/chapters/",
-                                 "title": "Cloud Computing for Science and Engineering"
-                              },
-                              {
-                                 "url": "https://docs.microsoft.com/en-us/azure/architecture/patterns/",
-                                 "title": "Cloud Design Patterns"
-                              },
-                              {
-                                 "url": "https://azure.microsoft.com/en-us/resources/designing-distributed-systems/",
-                                 "title": "Designing Distributed Systems"
-                              },
-                              {
-                                 "url": "https://azure.microsoft.com/mediahandler/files/resourcefiles/learn-azure-in-a-month-of-lunches/Learn_Azure_in_a_Month_of_Lunches.pdf",
-                                 "title": "Learn Azure in a Month of Lunches"
-                              },
-                              {
-                                 "url": "https://www.datadoghq.com/ebook/monitoring-modern-infrastructure/",
-                                 "title": "Monitoring Modern Infrastructure"
-                              },
-                              {
-                                 "url": "http://www.microsoft.com/en-us/download/details.aspx?id=29263",
-                                 "title": "Multi-tenant Applications for the Cloud, 3rd Edition"
-                              },
-                              {
-                                 "url": "https://docs.openstack.org/ops-guide/index.html",
-                                 "title": "OpenStack Operations Guide"
-                              },
-                              {
-                                 "url": "https://developers.redhat.com/books/introducing-istio-service-mesh-microservices/",
-                                 "title": "Streamline microservice management with Istio Service Mesh"
-                              },
-                              {
-                                 "url": "https://azure.microsoft.com/en-us/campaigns/developer-guide/",
-                                 "title": "The Developer’s Guide to Azure"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Competitive Programming",
-                           "entries": [
-                              {
-                                 "url": "https://cses.fi/book/book.pdf",
-                                 "title": "Competitive Programmer's Handbook"
-                              },
-                              {
-                                 "url": "https://cpbook.net/#CP1details",
-                                 "title": "Competitive Programming, 1st Edition"
-                              },
-                              {
-                                 "url": "https://cpbook.net/#CP2details",
-                                 "title": "Competitive Programming, 2nd Edition"
-                              },
-                              {
-                                 "url": "http://www.csc.kth.se/~jsannemo/slask/main.pdf",
-                                 "title": "Principles of Algorithmic Problem Solving"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Compiler Design",
-                           "entries": [
-                              {
-                                 "url": "https://web.archive.org/web/20170326232435/http://www.network-theory.co.uk/docs/gccintro/index.html",
-                                 "title": "An Introduction to GCC"
-                              },
-                              {
-                                 "url": "http://www.diku.dk/~torbenm/Basics/",
-                                 "title": "Basics of Compiler Design (Anniversary Edition)"
-                              },
-                              {
-                                 "url": "http://www.holub.com/software/compiler.design.in.c.html",
-                                 "title": "Compiler Design in C (1990)"
-                              },
-                              {
-                                 "url": "http://elvis.rowan.edu/~bergmann/books/Compiler_Design/c_cpp/Text/C_CppEd.pdf",
-                                 "title": "Compiler Design: Theory, Tools, and Examples, C/C++ Edition"
-                              },
-                              {
-                                 "url": "http://elvis.rowan.edu/~bergmann/books/Compiler_Design/java/CompilerDesignBook.pdf",
-                                 "title": "Compiler Design: Theory, Tools, and Examples, Java Edition"
-                              },
-                              {
-                                 "url": "http://lampwww.epfl.ch/~schinz/thesis-final-A4.pdf",
-                                 "title": "Compiling Scala for the Java Virtual Machine"
-                              },
-                              {
-                                 "url": "http://www.chilton-computing.org.uk/acl/literature/books/compilingtechniques/overview.htm",
-                                 "title": "Compiling Techniques (1969)"
-                              },
-                              {
-                                 "url": "http://www.craftinginterpreters.com",
-                                 "title": "Crafting Interpreters (:construction:)"
-                              },
-                              {
-                                 "url": "http://research.microsoft.com/en-us/um/people/simonpj/Papers/pj-lester-book/",
-                                 "title": "Implementing Functional Languages: A Tutorial"
-                              },
-                              {
-                                 "url": "http://www.stack.nl/~marcov/compiler.pdf",
-                                 "title": "Let's Build a Compiler"
-                              },
-                              {
-                                 "url": "http://web.stanford.edu/class/archive/cs/cs143/cs143.1128/",
-                                 "title": "Practical and Theoretical Aspects of Compiler Construction"
-                              },
-                              {
-                                 "url": "https://tomassetti.me/antlr-mega-tutorial/",
-                                 "title": "The ANTLR Mega Tutorial"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Computer Science",
-                           "entries": [
-                              {
-                                 "url": "https://www.cs.cmu.edu/~15110-s13/Wing06-ct.pdf",
-                                 "title": "Computational Thinking"
-                              },
-                              {
-                                 "url": "https://bitbucket.org/chrisbourke/computersciencei/src",
-                                 "title": "Computer Science I - Draft"
-                              },
-                              {
-                                 "url": "http://cse.unl.edu/~cbourke/ComputerScienceTwo.pdf",
-                                 "title": "Computer Science II - Draft"
-                              },
-                              {
-                                 "url": "https://www.openbookproject.net/books/StudentCSP/",
-                                 "title": "CS Principles: Big Ideas in Programming"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Computer Vision",
-                           "entries": [
-                              {
-                                 "url": "http://homepages.inf.ed.ac.uk/rbf/BOOKS/BANDB/bandb.htm",
-                                 "title": "Computer Vision"
-                              },
-                              {
-                                 "url": "http://szeliski.org/Book/",
-                                 "title": "Computer Vision: Algorithms and Applications"
-                              },
-                              {
-                                 "url": "http://www.computervisionmodels.com",
-                                 "title": "Computer Vision: Models, Learning, and Inference"
-                              },
-                              {
-                                 "url": "http://programmingcomputervision.com",
-                                 "title": "Programming Computer Vision with Python"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Containers",
-                           "entries": [
-                              {
-                                 "url": "http://odewahn.github.io/docker-jumpstart/",
-                                 "title": "Docker Jumpstart"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Database",
-                           "entries": [
-                              {
-                                 "url": "https://open.bccampus.ca/browse-our-collection/find-open-textbooks/?uuid=5b6f010a-0563-44d4-94c5-67caa515d2c5",
-                                 "title": "Database Design, 2nd Ed."
-                              },
-                              {
-                                 "url": "http://www.dcs.warwick.ac.uk/~hugh/TTM/Database-Explorations-revision-2.pdf",
-                                 "title": "Database Explorations"
-                              },
-                              {
-                                 "url": "http://public.dhe.ibm.com/software/dw/db2/express-c/wiki/Database_fundamentals.pdf",
-                                 "title": "Database Fundamentals"
-                              },
-                              {
-                                 "url": "http://www.dcs.warwick.ac.uk/~hugh/TTM/DTATRM.pdf",
-                                 "title": "Databases, Types, and The Relational Model: The Third Manifesto"
-                              },
-                              {
-                                 "url": "http://webdam.inria.fr/Alice/",
-                                 "title": "Foundations of Databases"
-                              },
-                              {
-                                 "url": "http://www.redbook.io",
-                                 "title": "Readings in Database Systems, 5th Ed."
-                              },
-                              {
-                                 "url": "http://people.cs.aau.dk/~csj/Thesis/",
-                                 "title": "Temporal Database Management"
-                              },
-                              {
-                                 "url": "http://web.cecs.pdx.edu/~maier/TheoryBook/TRD.html",
-                                 "title": "The Theory of Relational Databases"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Datamining",
-                           "entries": [
-                              {
-                                 "url": "http://guidetodatamining.com",
-                                 "title": "A Programmer's Guide to Data Mining"
-                              },
-                              {
-                                 "url": "http://www.oreilly.com/data/free/data-jujitsu.csp",
-                                 "title": "Data Jujitsu: The Art of Turning Data into Product"
-                              },
-                              {
-                                 "url": "https://en.wikibooks.org/wiki/Data_Mining_Algorithms_In_R",
-                                 "title": "Data Mining Algorithms In R"
-                              },
-                              {
-                                 "url": "http://arxiv.org/pdf/1206.1754v2.pdf",
-                                 "title": "Internet Advertising: An Interplay among Advertisers, Online Publishers, Ad Exchanges and Web Users"
-                              },
-                              {
-                                 "url": "https://docs.google.com/file/d/0B6iefdnF22XQeVZDSkxjZ0Z5VUE/edit?pli=1",
-                                 "title": "Introduction to Data Science"
-                              },
-                              {
-                                 "url": "https://leanpub.com/datasciencebook",
-                                 "title": "Introduction to Data Science"
-                              },
-                              {
-                                 "url": "http://www.mmds.org",
-                                 "title": "Mining of Massive Datasets"
-                              },
-                              {
-                                 "url": "http://schoolofdata.org/handbook/",
-                                 "title": "School of Data Handbook"
-                              },
-                              {
-                                 "url": "https://leanpub.com/LittleInferenceBook/read",
-                                 "title": "Statistical inference for data science"
-                              },
-                              {
-                                 "url": "https://www.analyticsvidhya.com/blog/2018/08/dimensionality-reduction-techniques-python/",
-                                 "title": "The Ultimate Guide to 12 Dimensionality Reduction Techniques (with Python codes)"
-                              },
-                              {
-                                 "url": "http://www.intechopen.com/books/theory-and-applications-for-advanced-text-mining",
-                                 "title": "Theory and Applications for Advanced Text Mining"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Game Development",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/Penaz91/2DGD_F0TH",
-                                 "title": "2D Game Development: From Zero To Hero"
-                              },
-                              {
-                                 "url": "https://turtleappstore.com/book/",
-                                 "title": "Coding With Minecraft"
-                              },
-                              {
-                                 "url": "https://mud.co.uk/richard/DesigningVirtualWorlds.pdf",
-                                 "title": "Designing Virtual Worlds"
-                              },
-                              {
-                                 "url": "http://www.gameaipro.com",
-                                 "title": "Game AI Pro"
-                              },
-                              {
-                                 "url": "https://ensadi.github.io/AGSBook/",
-                                 "title": "Game Design with AGS"
-                              },
-                              {
-                                 "url": "http://gameprogrammingpatterns.com",
-                                 "title": "Game Programming Patterns"
-                              },
-                              {
-                                 "url": "http://pcgbook.com",
-                                 "title": "Procedural Content Generation in Games"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Information Retrieval",
-                           "entries": [
-                              {
-                                 "url": "http://www.csee.umbc.edu/csee/research/cadip/readings/IR.report.120600.book.pdf",
-                                 "title": "Information Retrieval: A Survey"
-                              },
-                              {
-                                 "url": "http://nlp.stanford.edu/IR-book/information-retrieval-book.html",
-                                 "title": "Introduction to Information Retrieval"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Licensing",
-                           "entries": [
-                              {
-                                 "url": "http://www.aliprandi.org/cc-user-guide/",
-                                 "title": "Creative Commons: a user guide"
-                              },
-                              {
-                                 "url": "http://rosenlaw.com/oslbook/",
-                                 "title": "Open Source Licensing Software Freedom and Intellectual Property Law"
-                              },
-                              {
-                                 "url": "http://www.thepublicdomain.org/download/",
-                                 "title": "The Public Domain: Enclosing the Commons of the Mind"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Machine Learning",
-                           "entries": [
-                              {
-                                 "url": "https://arxiv.org/pdf/1709.02840.pdf",
-                                 "title": "A Brief Introduction to Machine Learning for Engineers"
-                              },
-                              {
-                                 "url": "http://www.dkriesel.com/en/science/neural_networks",
-                                 "title": "A Brief Introduction to Neural Networks"
-                              },
-                              {
-                                 "url": "https://www.eecs189.org/static/resources/comprehensive-guide.pdf",
-                                 "title": "A Comprehensive Guide to Machine Learning"
-                              },
-                              {
-                                 "url": "http://ciml.info/dl/v0_9/ciml-v0_9-all.pdf",
-                                 "title": "A Course in Machine Learning"
-                              },
-                              {
-                                 "url": "https://www.ics.uci.edu/~welling/teaching/ICS273Afall11/IntroMLBook.pdf",
-                                 "title": "A First Encounter with Machine Learning"
-                              },
-                              {
-                                 "url": "https://arxiv.org/abs/1904.05526",
-                                 "title": "A Selective Overview of Deep Learning"
-                              },
-                              {
-                                 "url": "https://sites.ualberta.ca/~szepesva/papers/RLAlgsInMDPs.pdf",
-                                 "title": "Algorithms for Reinforcement Learning"
-                              },
-                              {
-                                 "url": "http://www-bcf.usc.edu/~gareth/ISL/",
-                                 "title": "An Introduction to Statistical Learning"
-                              },
-                              {
-                                 "url": "http://web4.cs.ucl.ac.uk/staff/D.Barber/pmwiki/pmwiki.php?n=Brml.HomePage",
-                                 "title": "Bayesian Reasoning and Machine Learning"
-                              },
-                              {
-                                 "url": "http://www.deeplearningbook.org",
-                                 "title": "Deep Learning"
-                              },
-                              {
-                                 "url": "https://github.com/fastai/fastbook",
-                                 "title": "Deep Learning for Coders with Fastai and PyTorch"
-                              },
-                              {
-                                 "url": "https://pytorch.org/assets/deep-learning/Deep-Learning-with-PyTorch.pdf",
-                                 "title": "Deep Learning with PyTorch"
-                              },
-                              {
-                                 "url": "http://d2l.ai",
-                                 "title": "Dive into Deep Learning"
-                              },
-                              {
-                                 "url": "https://web.stanford.edu/group/pdplab/pdphandbook",
-                                 "title": "Explorations in Parallel Distributed Processing: A Handbook of Models, Programs, and Exercises"
-                              },
-                              {
-                                 "url": "https://mitpress.ublish.com/ereader/7093/?preview=#page/Cover",
-                                 "title": "Foundations of Machine Learning, Second Edition"
-                              },
-                              {
-                                 "url": "https://freeandopenmachinelearning.readthedocs.io/en/latest/index.html",
-                                 "title": "Free and Open Machine Learning"
-                              },
-                              {
-                                 "url": "http://www.gaussianprocess.org/gpml/",
-                                 "title": "Gaussian Processes for Machine Learning"
-                              },
-                              {
-                                 "url": "https://www.ibm.com/downloads/cas/GB8ZMQZ3",
-                                 "title": "IBM Machine Learning for Dummies"
-                              },
-                              {
-                                 "url": "http://www.inference.phy.cam.ac.uk/itila/",
-                                 "title": "Information Theory, Inference, and Learning Algorithms"
-                              },
-                              {
-                                 "url": "https://christophm.github.io/interpretable-ml-book/",
-                                 "title": "Interpretable Machine Learning"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/cntk_succinctly",
-                                 "title": "Introduction to CNTK Succinctly"
-                              },
-                              {
-                                 "url": "http://arxiv.org/abs/0904.3664v1",
-                                 "title": "Introduction to Machine Learning"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/keras-succinctly",
-                                 "title": "Keras Succinctly"
-                              },
-                              {
-                                 "url": "https://bitbucket.org/hrojas/learn-tensorflow",
-                                 "title": "Learn Tensorflow"
-                              },
-                              {
-                                 "url": "https://mila.quebec/wp-content/uploads/2019/08/TR1312.pdf",
-                                 "title": "Learning Deep Architectures for AI"
-                              },
-                              {
-                                 "url": "http://www.intechopen.com/books/machine_learning",
-                                 "title": "Machine Learning"
-                              },
-                              {
-                                 "url": "https://moa.cms.waikato.ac.nz/book-html/",
-                                 "title": "Machine Learning for Data Streams"
-                              },
-                              {
-                                 "url": "https://dafriedman97.github.io/mlbook/content/introduction.html",
-                                 "title": "Machine Learning from Scratch"
-                              },
-                              {
-                                 "url": "http://www1.maths.leeds.ac.uk/~charles/statlog/",
-                                 "title": "Machine Learning, Neural and Statistical Classification"
-                              },
-                              {
-                                 "url": "https://gwthomas.github.io/docs/math4ml.pdf",
-                                 "title": "Mathematics for Machine Learning"
-                              },
-                              {
-                                 "url": "https://mml-book.github.io",
-                                 "title": "Mathematics for Machine Learning"
-                              },
-                              {
-                                 "url": "http://neuralnetworksanddeeplearning.com",
-                                 "title": "Neural Networks and Deep Learning"
-                              },
-                              {
-                                 "url": "http://idiom.ucsd.edu/~rlevy/pmsl_textbook/text.html",
-                                 "title": "Probabilistic Models in the Study of Language"
-                              },
-                              {
-                                 "url": "https://www.digitalocean.com/community/books/python-machine-learning-projects-a-digitalocean-ebook",
-                                 "title": "Python Machine Learning Projects"
-                              },
-                              {
-                                 "url": "http://incompleteideas.net/book/RLbook2020.pdf",
-                                 "title": "Reinforcement Learning: An Introduction"
-                              },
-                              {
-                                 "url": "https://web.stanford.edu/~jurafsky/slp3/ed3book.pdf",
-                                 "title": "Speech and Language Processing (3rd Edition Draft)"
-                              },
-                              {
-                                 "url": "https://web.stanford.edu/~hastie/ElemStatLearn/",
-                                 "title": "The Elements of Statistical Learning"
-                              },
-                              {
-                                 "url": "https://intelligent-optimization.org/LIONbook/lionbook_3v0.pdf",
-                                 "title": "The LION Way: Machine Learning plus Intelligent Optimization"
-                              },
-                              {
-                                 "url": "http://thepythongamebook.com/en%3Astart",
-                                 "title": "The Python Game Book"
-                              },
-                              {
-                                 "url": "https://www.dezyre.com/article/top-10-machine-learning-algorithms/202",
-                                 "title": "Top 10 Machine Learning Algorithms Every Engineer Should Know"
-                              },
-                              {
-                                 "url": "https://www.cs.huji.ac.il/~shais/UnderstandingMachineLearning",
-                                 "title": "Understanding Machine Learning: From Theory to Algorithms"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Mathematics",
-                           "entries": [
-                              {
-                                 "url": "https://shoup.net/ntb/",
-                                 "title": "A Computational Introduction to Number Theory and Algebra"
-                              },
-                              {
-                                 "url": "http://math.sfsu.edu/beck/complex.html",
-                                 "title": "A First Course in Complex Analysis"
-                              },
-                              {
-                                 "url": "http://linear.ups.edu",
-                                 "title": "A First Course in Linear Algebra"
-                              },
-                              {
-                                 "url": "https://milneopentextbooks.org/a-friendly-introduction-to-mathematical-logic/",
-                                 "title": "A Friendly Introduction to Mathematical Logic"
-                              },
-                              {
-                                 "url": "https://osj1961.github.io/giam/",
-                                 "title": "A Gentle Introduction to the Art of Mathematics"
-                              },
-                              {
-                                 "url": "https://pimbook.org",
-                                 "title": "A Programmer's Introduction to Mathematics"
-                              },
-                              {
-                                 "url": "http://abstract.ups.edu",
-                                 "title": "Abstract Algebra: Theory and Applications"
-                              },
-                              {
-                                 "url": "https://scholarworks.gvsu.edu/books/20/",
-                                 "title": "Active Calculus"
-                              },
-                              {
-                                 "url": "http://www.math.stonybrook.edu/~aknapp/download/a2-alg-inside.pdf",
-                                 "title": "Advanced Algebra"
-                              },
-                              {
-                                 "url": "https://homepage.divms.uiowa.edu/~goodman/algebrabook.dir/algebrabook.html",
-                                 "title": "Algebra: Abstract and Concrete"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Algebra_Elementary_Text-Book_Part_I_Chrystal_edited.pdf",
-                                 "title": "Algebra: An Elementary Text-Book, Part I (1904)"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Algebra_Elementary_Text-Book_Part_II_Chrystal_edited02.pdf",
-                                 "title": "Algebra: An Elementary Text-Book, Part II (1900)"
-                              },
-                              {
-                                 "url": "https://pi.math.cornell.edu/~hatcher/AT/ATpage.html",
-                                 "title": "Algebraic Topology"
-                              },
-                              {
-                                 "url": "http://www.trillia.com/moser-number.html",
-                                 "title": "An Introduction to the Theory of Numbers"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Analytic_Geometry_Siceloff_Wentworth_Smith_edited.pdf",
-                                 "title": "Analytic Geometry (1922)"
-                              },
-                              {
-                                 "url": "https://www.apexcalculus.com",
-                                 "title": "APEX Calculus"
-                              },
-                              {
-                                 "url": "https://rellek.net/book/app-comb.html",
-                                 "title": "Applied Combinatorics"
-                              },
-                              {
-                                 "url": "https://faculty.uml.edu/klevasseur/ads2/",
-                                 "title": "Applied Discrete Structures"
-                              },
-                              {
-                                 "url": "http://www.math.stonybrook.edu/~aknapp/download/b2-alg-inside.pdf",
-                                 "title": "Basic Algebra"
-                              },
-                              {
-                                 "url": "https://www.jirka.org/ra/",
-                                 "title": "Basic Analysis: Introduction to Real Analysis"
-                              },
-                              {
-                                 "url": "http://www.cis.upenn.edu/~jean/math-basics.pdf",
-                                 "title": "Basics of Algebra, Topology, and Differential Calculus"
-                              },
-                              {
-                                 "url": "https://github.com/CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers",
-                                 "title": "Bayesian Methods for Hackers"
-                              },
-                              {
-                                 "url": "http://www.wallace.ccfaculty.org/book/book.html",
-                                 "title": "Beginning and Intermediate Algebra"
-                              },
-                              {
-                                 "url": "https://www.people.vcu.edu/~rhammack/BookOfProof/",
-                                 "title": "Book of Proof"
-                              },
-                              {
-                                 "url": "https://ocw.mit.edu/resources/res-18-001-calculus-online-textbook-spring-2005/textbook/",
-                                 "title": "Calculus"
-                              },
-                              {
-                                 "url": "https://resolver.caltech.edu/CaltechBOOK:1985.001",
-                                 "title": "Calculus I"
-                              },
-                              {
-                                 "url": "http://www.math.smith.edu/~callahan/intromine.html",
-                                 "title": "Calculus in Context"
-                              },
-                              {
-                                 "url": "http://www.gutenberg.org/ebooks/33283",
-                                 "title": "Calculus Made Easy"
-                              },
-                              {
-                                 "url": "https://mitpress.ublish.com/ereader/77/?preview#page/Cover",
-                                 "title": "Category Theory for the Sciences"
-                              },
-                              {
-                                 "url": "http://www.ck12.org/book/Probability-and-Statistics---Advanced-%2528Second-Edition%2529/",
-                                 "title": "CK-12 Probability and Statistics - Advanced"
-                              },
-                              {
-                                 "url": "https://www.math.ubc.ca/~CLP/CLP1/",
-                                 "title": "CLP-1 Differential Calculus"
-                              },
-                              {
-                                 "url": "https://www.math.ubc.ca/~CLP/CLP2/",
-                                 "title": "CLP-2 Integral Calculus"
-                              },
-                              {
-                                 "url": "https://www.math.ubc.ca/~CLP/CLP3/",
-                                 "title": "CLP-3 Multivariable Calculus"
-                              },
-                              {
-                                 "url": "https://www.math.ubc.ca/~CLP/CLP4/",
-                                 "title": "CLP-4 Vector Calculus"
-                              },
-                              {
-                                 "url": "http://cnx.org/contents/5e0744f9-9e79-4348-9237-ed012213a2d6%4040.9",
-                                 "title": "Collaborative Statistics"
-                              },
-                              {
-                                 "url": "https://bogart.openmathbooks.org",
-                                 "title": "Combinatorics Through Guided Discovery"
-                              },
-                              {
-                                 "url": "https://people.math.gatech.edu/~cain/winter99/complex.html",
-                                 "title": "Complex Analysis"
-                              },
-                              {
-                                 "url": "https://www.inferentialthinking.com",
-                                 "title": "Computational and Inferential Thinking. The Foundations of Data Science"
-                              },
-                              {
-                                 "url": "http://web.mit.edu/hyperbook/Patrikalakis-Maekawa-Cho/",
-                                 "title": "Computational Geometry"
-                              },
-                              {
-                                 "url": "http://sagebook.gforge.inria.fr/english.html",
-                                 "title": "Computational Mathematics with SageMath"
-                              },
-                              {
-                                 "url": "http://vassarstats.net/textbook/",
-                                 "title": "Concepts & Applications of Inferential Statistics"
-                              },
-                              {
-                                 "url": "https://web.stanford.edu/~boyd/cvxbook",
-                                 "title": "Convex Optimization"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Coordinate_Geometry_Fine_Thompson_edited03.pdf",
-                                 "title": "Coordinate Geometry (1911)"
-                              },
-                              {
-                                 "url": "http://tutorial.math.lamar.edu/Classes/DE/DE.aspx",
-                                 "title": "Differential Equations"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Differential_Equations_Phillips_edited.pdf",
-                                 "title": "Differential Equations (1922)"
-                              },
-                              {
-                                 "url": "http://discrete.openmathbooks.org/dmoi3.html",
-                                 "title": "Discrete Mathematics: An Open Introduction"
-                              },
-                              {
-                                 "url": "https://cseweb.ucsd.edu/~gill/BWLectSite/",
-                                 "title": "Discrete Mathematics: First and Second Course"
-                              },
-                              {
-                                 "url": "http://ramanujan.math.trinity.edu/wtrench/texts/TRENCH_DIFF_EQNS_I.PDF",
-                                 "title": "Elementary Differential Equations"
-                              },
-                              {
-                                 "url": "https://digitalcommons.trinity.edu/mono/9/",
-                                 "title": "Elementary Differential Equations (with Boundary Value Problems)"
-                              },
-                              {
-                                 "url": "https://wstein.org/ent/",
-                                 "title": "Elementary Number Theory: Primes, Congruences, and Secrets"
-                              },
-                              {
-                                 "url": "https://www.classicalrealanalysis.info/com/Elementary-Real-Analysis.php",
-                                 "title": "Elementary Real Analysis"
-                              },
-                              {
-                                 "url": "https://www.math.miami.edu/~ec/book/",
-                                 "title": "Elements of Abstract and Linear Algebra"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Elements_Differential_Integral_Calculus_Granville_edited_2.pdf",
-                                 "title": "Elements of Differential and Integral Calculus (1911)"
-                              },
-                              {
-                                 "url": "http://cs.gmu.edu/~sean/book/metaheuristics/",
-                                 "title": "Essentials of Metaheuristics"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/First_Algebra_Hawkes_Luby_Touton_edited.pdf",
-                                 "title": "First Course in Algebra (1910)"
-                              },
-                              {
-                                 "url": "https://www.math.ucsd.edu/~ebender/CombText/",
-                                 "title": "Foundations of Combinatorics with Applications"
-                              },
-                              {
-                                 "url": "https://arxiv.org/pdf/1906.01803.pdf",
-                                 "title": "Foundations of Constructive Probability Theory"
-                              },
-                              {
-                                 "url": "https://mphitchman.com",
-                                 "title": "Geometry with an Introduction to Cosmic Topology"
-                              },
-                              {
-                                 "url": "http://compalg.inf.elte.hu/~tony/Oktatas/TDK/FINAL/",
-                                 "title": "Graph Theory"
-                              },
-                              {
-                                 "url": "https://milneopentextbooks.org/how-we-got-from-there-to-here-a-story-of-real-analysis/",
-                                 "title": "How We Got from There to Here: A Story of Real Analysis"
-                              },
-                              {
-                                 "url": "https://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/book.html",
-                                 "title": "Introduction to Probability"
-                              },
-                              {
-                                 "url": "http://ocw.mit.edu/courses/mathematics/18-05-introduction-to-probability-and-statistics-spring-2014/",
-                                 "title": "Introduction to Probability and Statistics Spring 2014"
-                              },
-                              {
-                                 "url": "http://joshua.smcvt.edu/proofs/",
-                                 "title": "Introduction to Proofs"
-                              },
-                              {
-                                 "url": "https://digitalcommons.trinity.edu/mono/7/",
-                                 "title": "Introduction to Real Analysis"
-                              },
-                              {
-                                 "url": "http://people.math.umass.edu/~lavine/Book/book.html",
-                                 "title": "Introduction to Statistical Thought"
-                              },
-                              {
-                                 "url": "https://www.openintro.org/book/isrs/",
-                                 "title": "Introductory Statistics for the Life and Biomedical Sciences"
-                              },
-                              {
-                                 "url": "https://github.com/rlabbe/Kalman-and-Bayesian-Filters-in-Python",
-                                 "title": "Kalman and Bayesian Filters in Python"
-                              },
-                              {
-                                 "url": "http://www.or.deis.unibo.it/knapsack.html",
-                                 "title": "Knapsack Problems - Algorithms and Computer Implementations"
-                              },
-                              {
-                                 "url": "http://home.iitk.ac.in/~psraj/mth102/lecture_notes.html",
-                                 "title": "Lecture Notes of Linear Algebra"
-                              },
-                              {
-                                 "url": "https://www.poritz.net/jonathan/share/ldlos.pdf",
-                                 "title": "Lies, Damned Lies, or Statistics: How to Tell the Truth with Statistics"
-                              },
-                              {
-                                 "url": "http://home.iitk.ac.in/~arlal/book/la.pdf",
-                                 "title": "Linear Algebra"
-                              },
-                              {
-                                 "url": "https://www.math.ucdavis.edu/~linear/linear-guest.pdf",
-                                 "title": "Linear Algebra"
-                              },
-                              {
-                                 "url": "http://joshua.smcvt.edu/linearalgebra/",
-                                 "title": "Linear Algebra"
-                              },
-                              {
-                                 "url": "https://www.math.brown.edu/streil/papers/LADW/LADW.html",
-                                 "title": "Linear Algebra Done Wrong"
-                              },
-                              {
-                                 "url": "https://people.math.gatech.edu/~herod/Hspace/Hspace.html",
-                                 "title": "Linear Algebra, Infinite Dimensions, and Maple"
-                              },
-                              {
-                                 "url": "http://www.mathphysics.com/pde",
-                                 "title": "Linear Methods of Applied Mathematics"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Magic_Squares_Cubes_Andrews_edited.pdf",
-                                 "title": "Magic Squares and Cubes (1917)"
-                              },
-                              {
-                                 "url": "https://www.opentextbookstore.com/mathinsociety/",
-                                 "title": "Math in Society"
-                              },
-                              {
-                                 "url": "http://www.trillia.com/zakon-analysisI.html",
-                                 "title": "Mathematical Analysis I"
-                              },
-                              {
-                                 "url": "https://classicalrealanalysis.info/com/Mathematical-Discovery.php",
-                                 "title": "Mathematical Discovery"
-                              },
-                              {
-                                 "url": "http://www.ii.uib.no/~michal/und/i227/book/book.pdf",
-                                 "title": "Mathematical Logic - an Introduction"
-                              },
-                              {
-                                 "url": "https://www.tedsundstrom.com/mathematical-reasoning-3",
-                                 "title": "Mathematical Reasoning: Writing and Proof"
-                              },
-                              {
-                                 "url": "http://home.iitk.ac.in/~psraj/mth101/",
-                                 "title": "Mathematics, MTH101A"
-                              },
-                              {
-                                 "url": "https://www.huber.embl.de/msmb",
-                                 "title": "Modern Statistics for Modern Biology"
-                              },
-                              {
-                                 "url": "https://people.math.gatech.edu/~cain/notes/calculus.html",
-                                 "title": "Multivariable Calculus"
-                              },
-                              {
-                                 "url": "http://luc.devroye.org/rnbookindex.html",
-                                 "title": "Non-Uniform Random Variate Generation"
-                              },
-                              {
-                                 "url": "https://www.jirka.org/diffyqs/",
-                                 "title": "Notes on Diffy Qs"
-                              },
-                              {
-                                 "url": "https://github.com/holdenlee/number-theory",
-                                 "title": "Number Theory"
-                              },
-                              {
-                                 "url": "http://math.gordon.edu/ntic/",
-                                 "title": "Number Theory: In Context and Interactive"
-                              },
-                              {
-                                 "url": "https://jonathanweisberg.org/vip/",
-                                 "title": "Odds and Ends: Introducing Probability & Decision with a Visual Emphasis"
-                              },
-                              {
-                                 "url": "http://onlinestatbook.com",
-                                 "title": "Online Statistics Education"
-                              },
-                              {
-                                 "url": "https://www.openintro.org/stat/textbook.php",
-                                 "title": "OpenIntro Statistics"
-                              },
-                              {
-                                 "url": "https://spaces.pcc.edu/pages/viewpage.action?pageId=52729944",
-                                 "title": "ORCCA: Open Resources for Community College Algebra"
-                              },
-                              {
-                                 "url": "https://en.wikibooks.org/wiki/Ordinary_Differential_Equations",
-                                 "title": "Ordinary Differential Equations"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Plane_Geometry_Wentworth_Smith_edited.pdf",
-                                 "title": "Plane Geometry (1913)"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Plane_Spherical_Trigonometry_Wentworth_Smith_edited_2.pdf",
-                                 "title": "Planes and Spherical Trigonometry (1915)"
-                              },
-                              {
-                                 "url": "https://stitz-zeager.com",
-                                 "title": "Precalculus"
-                              },
-                              {
-                                 "url": "http://statistics.zone",
-                                 "title": "Probability and Statistics Cookbook"
-                              },
-                              {
-                                 "url": "http://wiki.stat.ucla.edu/socr/index.php/Probability_and_statistics_EBook",
-                                 "title": "Probability and Statistics EBook"
-                              },
-                              {
-                                 "url": "https://www.markhuberdatascience.org/probability-textbook",
-                                 "title": "Probability: Lectures and Labs"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Recreations_in_Mathematics_Licks_edited.pdf",
-                                 "title": "Recreations in Math"
-                              },
-                              {
-                                 "url": "http://www.gregorybard.com/books.html",
-                                 "title": "Sage for Undergraduates"
-                              },
-                              {
-                                 "url": "http://djm.cc/library/Second_Algebra_Hawkes_Luby_Touton_edited.pdf",
-                                 "title": "Second Course in Algebra"
-                              },
-                              {
-                                 "url": "https://arxiv.org/pdf/1803.05316.pdf",
-                                 "title": "Seven Sketches in Compositionality: An Invitation to Applied Category Theory"
-                              },
-                              {
-                                 "url": "https://statsthinking21.org",
-                                 "title": "Statistical Thinking for the 21st Century"
-                              },
-                              {
-                                 "url": "http://www.statisticsdonewrong.com",
-                                 "title": "Statistics Done Wrong"
-                              },
-                              {
-                                 "url": "https://www.stat.berkeley.edu/~stark/SticiGui/",
-                                 "title": "SticiGui"
-                              },
-                              {
-                                 "url": "https://lqbrin.github.io/tea-time-numerical/",
-                                 "title": "Tea Time Numerical Analysis"
-                              },
-                              {
-                                 "url": "https://web.engr.oregonstate.edu/~rosulekm/crypto/",
-                                 "title": "The Joy of Cryptography (2020)"
-                              },
-                              {
-                                 "url": "http://www.greenteapress.com/thinkbayes/",
-                                 "title": "Think Bayes: Bayesian Statistics Made Simple"
-                              },
-                              {
-                                 "url": "http://greenteapress.com/thinkstats/",
-                                 "title": "Think Stats: Probability and Statistics for Programmers"
-                              },
-                              {
-                                 "url": "http://www.mecmath.net",
-                                 "title": "Vector Calculus"
-                              },
-                              {
-                                 "url": "https://www.poritz.net/jonathan/share/yaintt.pdf",
-                                 "title": "Yet Another Introductory Number Theory Textbook"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Mathematics For Computer Science",
-                           "entries": [
-                              {
-                                 "url": "https://archive.org/details/bstj27-4-623",
-                                 "title": "A Mathematical Theory of Communication"
-                              },
-                              {
-                                 "url": "http://cglab.ca/~michiel/DiscreteStructures/",
-                                 "title": "Discrete Structures for Computer Science: Counting, Recursion, and Probability"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Misc",
-                           "entries": [
-                              {
-                                 "url": "https://ithemes.com/wp-content/uploads/downloads/2012/09/10-keys-to-great-landing-pages-eBook.pdf",
-                                 "title": "10 Keys to Great Landing Pages"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/radar/2016-european-software-development-salary-survey/",
-                                 "title": "2016 European Software Development Salary Survey"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/radar/2016-software-development-salary-survey-report/",
-                                 "title": "2016 Software Development Salary Survey"
-                              },
-                              {
-                                 "url": "https://leanpub.com/97-Things-Every-Programmer-Should-Know-Extended",
-                                 "title": "97 Things Every Programmer Should Know - Extended"
-                              },
-                              {
-                                 "url": "http://ocaml-book.com/s/popbook.pdf",
-                                 "title": "A MACHINE MADE THIS BOOK ten sketches of computer science"
-                              },
-                              {
-                                 "url": "https://www.ansible.com/ebooks",
-                                 "title": "Ansible Up & Running (first three chapters)"
-                              },
-                              {
-                                 "url": "http://solmu.org/pub/help/Asterisk/3nd_Edition_for_Asterisk_1.8",
-                                 "title": "Asterisk™: The Definitive Guide"
-                              },
-                              {
-                                 "url": "http://www.tec-it.com/download/PDF/Barcode_Reference_EN.pdf",
-                                 "title": "Barcode Overview"
-                              },
-                              {
-                                 "url": "https://d28rh4a8wq0iu5.cloudfront.net/bitcointech/readings/princeton_bitcoin_book.pdf",
-                                 "title": "Bitcoin and Cryptocurrency Technologies"
-                              },
-                              {
-                                 "url": "http://www.wisdom.weizmann.ac.il/~playbook/",
-                                 "title": "Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts"
-                              },
-                              {
-                                 "url": "http://www.usingcsp.com/cspbook.pdf",
-                                 "title": "Communicating Sequential Processes"
-                              },
-                              {
-                                 "url": "http://www.jackkinsella.ie/books/confessions_of_an_unintentional_cto",
-                                 "title": "Confessions of an Unintentional CTO: Lessons in Growing a Web App"
-                              },
-                              {
-                                 "url": "http://hintjens.com/books",
-                                 "title": "Culture & Empire: Digital Revolution"
-                              },
-                              {
-                                 "url": "http://designwithfontforge.com/en-US/index.html",
-                                 "title": "Design With FontForge"
-                              },
-                              {
-                                 "url": "http://designinginterfaces.com",
-                                 "title": "Designing Interfaces"
-                              },
-                              {
-                                 "url": "http://devdocs.io",
-                                 "title": "DevDocs"
-                              },
-                              {
-                                 "url": "http://www.ibm.com/ibm/devops/us/en/resources/dummiesbooks/",
-                                 "title": "DevOps For Dummies (IBM Edition)"
-                              },
-                              {
-                                 "url": "http://www.sp4comm.org",
-                                 "title": "Digital Signal Processing For Communications"
-                              },
-                              {
-                                 "url": "http://www.dspguide.com",
-                                 "title": "Digital Signal Processing For Engineers and Scientists"
-                              },
-                              {
-                                 "url": "https://greenteapress.com/wp/think-dsp",
-                                 "title": "Digital Signal Processing in Python"
-                              },
-                              {
-                                 "url": "http://www.lulu.com/shop/http://www.lulu.com/shop/luis-enr%C3%ADquez-a/dynamic-linked-libraries-paradigms-of-the-gpl-license-in-contemporary-software/ebook/product-21419788.html",
-                                 "title": "\"DYNAMIC LINKED LIBRARIES\": Paradigms of the GPL license in contemporary software"
-                              },
-                              {
-                                 "url": "https://images.guide",
-                                 "title": "Essential Image Optimization"
-                              },
-                              {
-                                 "url": "http://openmymind.net/FoundationsOfProgramming.pdf",
-                                 "title": "Foundations of Programming"
-                              },
-                              {
-                                 "url": "https://basecamp.com/books/getting-real",
-                                 "title": "Getting Real"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/google_maps_api_succinctly",
-                                 "title": "Google Maps API Succinctly"
-                              },
-                              {
-                                 "url": "http://www.lulu.com/shop/ed-johnson/hacknot-essays-on-software-development/ebook/product-17544641.html",
-                                 "title": "Hacknot: Essays on Software Development"
-                              },
-                              {
-                                 "url": "https://lazyfoo.net/tutorials/SDL",
-                                 "title": "Hello SDL"
-                              },
-                              {
-                                 "url": "https://andreask.cs.illinois.edu/Teaching/HPCFall2012",
-                                 "title": "High-Performance Scientific Computing"
-                              },
-                              {
-                                 "url": "https://ryheimat.github.io/holm-school",
-                                 "title": "Holm School (You Might Learn Something) - How to Teach Yourself To Be A Computer Scientist for Hamiltons a Month"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/hololens_succinctly",
-                                 "title": "HoloLens Succinctly"
-                              },
-                              {
-                                 "url": "http://www.fastchip.net/howcomputerswork/p1.html",
-                                 "title": "How Computers Work"
-                              },
-                              {
-                                 "url": "http://softwarebyrob.wpengine.netdna-cdn.com/assets/Software_by_Rob%20_How_to_Become_a%20_Programmer_1.0.pdf",
-                                 "title": "How to Become a Programmer"
-                              },
-                              {
-                                 "url": "http://openbookproject.net/thinkcs/",
-                                 "title": "How to Think Like a Computer Scientist"
-                              },
-                              {
-                                 "url": "http://homepages.inf.ed.ac.uk/rbf/BOOKS/PHILLIPS/",
-                                 "title": "Image Processing in C: Analyzing and Enhancing Digital Images"
-                              },
-                              {
-                                 "url": "http://florida.theorangegrove.org/og/file/49843a6a-9a9d-4bad-b4d4-d053f9cdf73e/1/InfoTechNetworkedEconomy.pdf",
-                                 "title": "Information Technology and the Networked Economy"
-                              },
-                              {
-                                 "url": "https://web.corral.tacc.utexas.edu/CompEdu/pdf/isp/EijkhoutIntroSciProgramming-book.pdf",
-                                 "title": "Introduction to Scientific Programming in C++ and Fortran"
-                              },
-                              {
-                                 "url": "https://www.gitbook.com/book/scemama/irpf90/details",
-                                 "title": "IRPF90 Fortran code generator"
-                              },
-                              {
-                                 "url": "https://progbook.org",
-                                 "title": "Learn Programming"
-                              },
-                              {
-                                 "url": "https://pine.fm/LearnToProgram/",
-                                 "title": "Learn to Program"
-                              },
-                              {
-                                 "url": "https://blog.openshift.com/learning-30-technologies-in-30-days-a-developer-challenge/",
-                                 "title": "Learning 30 Technologies in 30 Days: A Developer Challenge"
-                              },
-                              {
-                                 "url": "http://patterns.dataincubator.org/book/",
-                                 "title": "Linked Data Patterns: A pattern catalogue for modelling, publishing, and consuming Linked Data"
-                              },
-                              {
-                                 "url": "http://worrydream.com/#!/MagicInk",
-                                 "title": "Magic Ink: Information Software and The Graphical Interface"
-                              },
-                              {
-                                 "url": "https://github.com/bitcoinbook/bitcoinbook",
-                                 "title": "Mastering Bitcoin - Unlocking digital currencies"
-                              },
-                              {
-                                 "url": "https://leanpub.com/mobiledevelopersguide",
-                                 "title": "Mobile Developer's Guide to the Galaxy"
-                              },
-                              {
-                                 "url": "http://www.wisdom.weizmann.ac.il/~harel/reactive_systems.html",
-                                 "title": "Modeling Reactive Systems with Statecharts"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/msix-succinctly",
-                                 "title": "MSIX Succinctly"
-                              },
-                              {
-                                 "url": "http://www.cs.cornell.edu/home/kleinber/networks-book/",
-                                 "title": "Networks, Crowds, and Markets: Reasoning About a Highly Connected World"
-                              },
-                              {
-                                 "url": "http://win.ua.ac.be/~sdemey/",
-                                 "title": "Object-Oriented Reengineering Patterns"
-                              },
-                              {
-                                 "url": "https://github.com/oreillymedia/open_government",
-                                 "title": "Open Government; Collaboration, Transparency, and Participation in Practice"
-                              },
-                              {
-                                 "url": "https://leanpub.com/PDQ",
-                                 "title": "PDQ: Pretty Darn Quick: An Agile, All-Purpose Methodology"
-                              },
-                              {
-                                 "url": "http://www.cse.buffalo.edu/~rapaport/Papers/phics.pdf",
-                                 "title": "Philosophy of Computer Science"
-                              },
-                              {
-                                 "url": "https://schadokar.dev/ebooks/playtime-with-hyperledger-composer/",
-                                 "title": "Playtime with Hyperledger Composer"
-                              },
-                              {
-                                 "url": "http://www.libpng.org/pub/png/book/",
-                                 "title": "PNG: The Definitive Guide"
-                              },
-                              {
-                                 "url": "http://cslibrary.stanford.edu/102/PointersAndMemory.pdf",
-                                 "title": "Pointers And Memory"
-                              },
-                              {
-                                 "url": "http://ocw.mit.edu/resources/res-6-004-principles-of-computer-system-design-an-introduction-spring-2009/online-textbook/part_ii_open_5_0.pdf",
-                                 "title": "Principles of Computer System Design"
-                              },
-                              {
-                                 "url": "http://unicodebook.readthedocs.org",
-                                 "title": "Programming with Unicode"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/ideas/real-world-maintainable-software",
-                                 "title": "Real-World Maintainable Software"
-                              },
-                              {
-                                 "url": "https://leanpub.com/manualToAutomatedWithSeleniumIDEAndSahi",
-                                 "title": "Record-Playback Test Automation: Sahi & Selenium IDE: Critical Evaluation of Record-Playback Automation Tools"
-                              },
-                              {
-                                 "url": "https://divakarvi.github.io/bk-spca/spca.html",
-                                 "title": "Scientific Programming and Computer Architecture"
-                              },
-                              {
-                                 "url": "http://faculty.washington.edu/stiber/pubs/Signal-Computing/Signal%20Computing.pdf",
-                                 "title": "Signal Computing: Digital Signals in the Software Domain"
-                              },
-                              {
-                                 "url": "http://www.smallmemory.com/book.html",
-                                 "title": "Small Memory Software"
-                              },
-                              {
-                                 "url": "https://almanac.httparchive.org/static/pdfs/web_almanac_2019_en.pdf",
-                                 "title": "Web Almanac"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/writing_native_mobile_apps_in_a_functional_language_succinctly",
-                                 "title": "Writing Native Mobile Apps in a Functional Language Succinctly"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "MOOC",
-                           "entries": [
-                              {
-                                 "url": "https://www.coursera.org",
-                                 "title": "Coursera"
-                              },
-                              {
-                                 "url": "https://www.edx.org",
-                                 "title": "edX"
-                              },
-                              {
-                                 "url": "https://www.freecodecamp.org",
-                                 "title": "freeCodeCamp"
-                              },
-                              {
-                                 "url": "https://www.futurelearn.com",
-                                 "title": "FutureLearn"
-                              },
-                              {
-                                 "url": "http://ocw.mit.edu",
-                                 "title": "MIT OCW"
-                              },
-                              {
-                                 "url": "https://onlinecourses.nptel.ac.in",
-                                 "title": "NPTEL"
-                              },
-                              {
-                                 "url": "https://open.hpi.de",
-                                 "title": "openHPI"
-                              },
-                              {
-                                 "url": "https://open.sap.com",
-                                 "title": "openSAP"
-                              },
-                              {
-                                 "url": "https://courses.platzi.com",
-                                 "title": "Platzi"
-                              },
-                              {
-                                 "url": "https://www.udacity.com",
-                                 "title": "Udacity"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Networking",
-                           "entries": [
-                              {
-                                 "url": "http://intronetworks.cs.luc.edu",
-                                 "title": "An Introduction to Computer Networks"
-                              },
-                              {
-                                 "url": "http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-02-introduction-to-eecs-ii-digital-communication-systems-fall-2012/readings/",
-                                 "title": "Bits, Signals, and Packets: An Introduction to Digital Communications and Networks"
-                              },
-                              {
-                                 "url": "http://hintjens.wdfiles.com/local--files/main%3Afiles/cc1pe.pdf",
-                                 "title": "Code Connected vol.1"
-                              },
-                              {
-                                 "url": "http://cnp3book.info.ucl.ac.be/1st/html/index.html",
-                                 "title": "Computer Networking : Principles, Protocols and Practice"
-                              },
-                              {
-                                 "url": "https://book.systemsapproach.org",
-                                 "title": "Computer Networks: A Systems Approach"
-                              },
-                              {
-                                 "url": "http://book.mixu.net/distsys/single-page.html",
-                                 "title": "Distributed systems for fun and profit"
-                              },
-                              {
-                                 "url": "https://hpbn.co",
-                                 "title": "High-Performance Browser Networking"
-                              },
-                              {
-                                 "url": "https://howhttps.works",
-                                 "title": "How HTTPS Works"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/ebooks/http",
-                                 "title": "HTTP Succinctly, Syncfusion"
-                              },
-                              {
-                                 "url": "http://daniel.haxx.se/http2/",
-                                 "title": "HTTP2 Explained"
-                              },
-                              {
-                                 "url": "https://launchschool.com/books/http",
-                                 "title": "Introduction to HTTP"
-                              },
-                              {
-                                 "url": "https://sites.google.com/site/yartikhiy/home/ipv6book",
-                                 "title": "IPv6 for IPv4 Experts"
-                              },
-                              {
-                                 "url": "https://assets.confluent.io/m/1b509accf21490f0/original/20170707-EB-Confluent_Kafka_Definitive-Guide_Complete.pdf",
-                                 "title": "Kafka, The definitive Guide"
-                              },
-                              {
-                                 "url": "http://networksciencebook.com",
-                                 "title": "Network Science"
-                              },
-                              {
-                                 "url": "http://www.tcpipguide.com/free/t_toc.htm",
-                                 "title": "The TCP/IP Guide"
-                              },
-                              {
-                                 "url": "http://pages.di.unipi.it/ricci/501302.pdf",
-                                 "title": "Understanding IP Addressing: Everything you ever wanted to know"
-                              },
-                              {
-                                 "url": "http://zguide.zeromq.org/page%3Aall",
-                                 "title": "ZeroMQ Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Open Source Ecosystem",
-                           "entries": [
-                              {
-                                 "url": "http://datajournalismhandbook.org",
-                                 "title": "Data Journalism Handbook"
-                              },
-                              {
-                                 "url": "https://archive.org/details/faif-2.0",
-                                 "title": "Free as in Freedom: Richard Stallman and the free software revolution"
-                              },
-                              {
-                                 "url": "https://unglue.it/work/136445/",
-                                 "title": "Free for All"
-                              },
-                              {
-                                 "url": "http://shop.fsf.org/product/free-software-free-society-2/",
-                                 "title": "Free Software, Free Society: Selected Essays of Richard M. Stallman"
-                              },
-                              {
-                                 "url": "http://www.oreilly.com/programming/free/getting-started-with-innersource.csp",
-                                 "title": "Getting Started with InnerSource"
-                              },
-                              {
-                                 "url": "http://public.dhe.ibm.com/software/dw/db2/express-c/wiki/Getting_started_with_open_source_development_p2.pdf",
-                                 "title": "Getting started with Open source development"
-                              },
-                              {
-                                 "url": "https://about.gitlab.com/handbook/",
-                                 "title": "GitLab Handbook"
-                              },
-                              {
-                                 "url": "https://opensource.com/resources/ebook/how-get-started-open-source",
-                                 "title": "How to get started with open source"
-                              },
-                              {
-                                 "url": "http://dreamsongs.com/IHE/IHE.html",
-                                 "title": "Innovation Happens Elsewhere"
-                              },
-                              {
-                                 "url": "https://do1.dr-chuck.net/net-intro/EN_us/net-intro.pdf",
-                                 "title": "Introduction to Networking"
-                              },
-                              {
-                                 "url": "http://open-advice.org",
-                                 "title": "Open Advice: FOSS: What We Wish We Had Known When We Started"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/ideas/open-source-in-brazil",
-                                 "title": "Open source in Brazil"
-                              },
-                              {
-                                 "url": "http://producingoss.com",
-                                 "title": "Producing Open Source Software"
-                              },
-                              {
-                                 "url": "http://www.aosabook.org/en/index.html",
-                                 "title": "The Architecture of Open Source Applications: Vol. 1: Elegance, Evolution, and a Few Fearless Hacks; Vol. 2: Structure, Scale, and a Few More Feerless Hacks"
-                              },
-                              {
-                                 "url": "http://artofcommunityonline.org/Art_of_Community_Second_Edition.pdf",
-                                 "title": "The Art of Community"
-                              },
-                              {
-                                 "url": "http://www.catb.org/esr/writings/cathedral-bazaar/",
-                                 "title": "The Cathedral and the Bazaar"
-                              },
-                              {
-                                 "url": "http://futureoftheinternet.org",
-                                 "title": "The Future of the Internet"
-                              },
-                              {
-                                 "url": "http://www.theopensourceway.org/book/",
-                                 "title": "The Open Source Way"
-                              },
-                              {
-                                 "url": "http://cyber.law.harvard.edu/wealth_of_networks/Main_Page",
-                                 "title": "The Wealth of Networks: How Social Production Transforms Markets and Freedom"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Operating Systems",
-                           "entries": [
-                              {
-                                 "url": "http://markburgess.org/os/os.pdf",
-                                 "title": "A short introduction to operating systems (2001)"
-                              },
-                              {
-                                 "url": "http://www.bottomupcs.com",
-                                 "title": "Computer Science from the Bottom Up"
-                              },
-                              {
-                                 "url": "https://github.com/SamyPesse/How-to-Make-a-Computer-Operating-System",
-                                 "title": "How to Make a Computer Operating System"
-                              },
-                              {
-                                 "url": "http://mikeos.sourceforge.net/write-your-own-os.html",
-                                 "title": "How to write a simple operating system in assembly language"
-                              },
-                              {
-                                 "url": "https://gustavus.edu/mcs/max/os-book/",
-                                 "title": "Operating Systems and Middleware"
-                              },
-                              {
-                                 "url": "http://pages.cs.wisc.edu/~remzi/OSTEP/",
-                                 "title": "Operating Systems: Three Easy Pieces"
-                              },
-                              {
-                                 "url": "http://www.nobius.org/~dbg/practical-file-system-design.pdf",
-                                 "title": "Practical File System Design: The Be File System"
-                              },
-                              {
-                                 "url": "http://people.inf.ethz.ch/wirth/ProjectOberon/index.html",
-                                 "title": "Project Oberon: The Design of an Operating System, a Compiler, and a Computer"
-                              },
-                              {
-                                 "url": "http://catb.org/esr/writings/taoup/html/",
-                                 "title": "The Art of Unix Programming"
-                              },
-                              {
-                                 "url": "http://www.fixup.fi/misc/rumpkernel-book/",
-                                 "title": "The Design and Implementation of the Anykernel and Rump Kernels"
-                              },
-                              {
-                                 "url": "https://littleosbook.github.io",
-                                 "title": "The little book about OS development"
-                              },
-                              {
-                                 "url": "http://greenteapress.com/semaphores/",
-                                 "title": "The Little Book of Semaphores"
-                              },
-                              {
-                                 "url": "http://www.greenteapress.com/thinkos/index.html",
-                                 "title": "Think OS: A Brief Introduction to Operating Systems"
-                              },
-                              {
-                                 "url": "http://www.compsci.hunter.cuny.edu/~sweiss/course_materials/unix_lecture_notes.php",
-                                 "title": "UNIX Application and System Programming, lecture notes"
-                              },
-                              {
-                                 "url": "http://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf",
-                                 "title": "Writing a Simple Operating System from Scratch"
-                              },
-                              {
-                                 "url": "https://pdos.csail.mit.edu/6.828/2012/xv6.html",
-                                 "title": "Xv6, a simple Unix-like teaching operating system"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Parallel Programming",
-                           "entries": [
-                              {
-                                 "url": "http://cnx.org/contents/bb821554-7f76-44b1-89e7-8a2a759d1347%405.2",
-                                 "title": "High Performance Computing"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20170702124132/https://hpc.llnl.gov/training/tutorials",
-                                 "title": "High Performance Computing Training"
-                              },
-                              {
-                                 "url": "https://andreask.cs.illinois.edu/Teaching/HPCFall2012",
-                                 "title": "High-Performance Scientific Computing"
-                              },
-                              {
-                                 "url": "http://pages.tacc.utexas.edu/~eijkhout/istc/istc.html",
-                                 "title": "Introduction to High-Performance Scientific Computing"
-                              },
-                              {
-                                 "url": "https://computing.llnl.gov/tutorials/parallel_comp/",
-                                 "title": "Introduction to Parallel Computing"
-                              },
-                              {
-                                 "url": "https://www.kernel.org/pub/linux/kernel/people/paulmck/perfbook/perfbook.html",
-                                 "title": "Is Parallel Programming Hard, And, If So, What Can You Do About It?"
-                              },
-                              {
-                                 "url": "http://heather.cs.ucdavis.edu/parprocbook",
-                                 "title": "Programming on Parallel Machines; GPU, Multicore, Clusters and More"
-                              },
-                              {
-                                 "url": "https://us.fixstars.com/products/opencl/book/OpenCLProgrammingBook/contents/",
-                                 "title": "The OpenCL Programming Book"
-                              },
-                              {
-                                 "url": "http://bookboon.com/en/using-concurrency-and-parallelism-effectively-i-ebook",
-                                 "title": "Using Concurrency and Parallelism Effectively – I"
-                              },
-                              {
-                                 "url": "http://bookboon.com/en/using-concurrency-and-parallelism-effectively-ii-ebook",
-                                 "title": "Using Concurrency and Parallelism Effectively – II"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Partial Evaluation",
-                           "entries": [
-                              {
-                                 "url": "http://www.itu.dk/people/sestoft/pebook/",
-                                 "title": "Partial Evaluation and Automatic Program Generation"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Professional Development",
-                           "entries": [
-                              {
-                                 "url": "https://www.gitbook.com/book/ccd_school/clean-code-developer-com/details",
-                                 "title": "Clean Code Developer: An initiative for more professionalism in software development"
-                              },
-                              {
-                                 "url": "https://www.red-gate.com/library/confessions-of-an-it-manager",
-                                 "title": "Confessions of an IT Manager"
-                              },
-                              {
-                                 "url": "https://www.red-gate.com/library/dont-just-roll-the-dice",
-                                 "title": "Don't Just Roll the Dice"
-                              },
-                              {
-                                 "url": "https://leanpub.com/dowhatyoulove/read",
-                                 "title": "How to Do What You Love & Earn What You’re Worth as a Programmer"
-                              },
-                              {
-                                 "url": "https://mixmastamyk.bitbucket.io/pro_soft_dev/intro.html",
-                                 "title": "Professional Software Development For Students"
-                              },
-                              {
-                                 "url": "https://leanpub.com/shippingsoftware/read",
-                                 "title": "What I've Learned From Failure"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Programming Paradigms",
-                           "entries": [
-                              {
-                                 "url": "http://jpaulmorrison.com/fbp/",
-                                 "title": "Flow based Programming"
-                              },
-                              {
-                                 "url": "http://www.cl.cam.ac.uk/teaching/Lectures/funprog-jrh-1996/",
-                                 "title": "Introduction to Functional Programming"
-                              },
-                              {
-                                 "url": "https://assets.confluent.io/m/2a60fabedb2dfbb1/original/20190307-EB-Making_Sense_of_Stream_Processing_Confluent.pdf",
-                                 "title": "Making Sense of Stream Processing"
-                              },
-                              {
-                                 "url": "https://mostly-adequate.gitbooks.io/mostly-adequate-guide/content/",
-                                 "title": "Mostly Adequate Guide to Functional Programming"
-                              },
-                              {
-                                 "url": "https://github.com/linpengcheng/PurefunctionPipelineDataflow",
-                                 "title": "The Pure Function Pipeline Data Flow v3.0 ---- the Grand Unified Programming Theory"
-                              },
-                              {
-                                 "url": "https://www.cs.kent.ac.uk/people/staff/sjt/TTFP/",
-                                 "title": "Type Theory and Functional Programming"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Regular Expressions",
-                           "entries": [
-                              {
-                                 "url": "https://learnbyexample.github.io/learn_js_regexp/",
-                                 "title": "JavaScript RegExp"
-                              },
-                              {
-                                 "url": "https://learnbyexample.github.io/py_regular_expressions/",
-                                 "title": "Python re(gex)?"
-                              },
-                              {
-                                 "url": "https://refrf.shreyasminocha.me",
-                                 "title": "Regular Expressions for Regular Folk"
-                              },
-                              {
-                                 "url": "http://www.rexegg.com",
-                                 "title": "RexEgg"
-                              },
-                              {
-                                 "url": "https://learnbyexample.github.io/Ruby_Regexp/",
-                                 "title": "Ruby Regexp"
-                              },
-                              {
-                                 "url": "http://www.codeproject.com/Articles/9099/The-Minute-Regex-Tutorial",
-                                 "title": "The 30 Minute Regex Tutorial"
-                              },
-                              {
-                                 "url": "https://leanpub.com/bastards-regexes",
-                                 "title": "The Bastards Book of Regular Expressions: Finding Patterns in Everyday Text"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Reverse Engineering",
-                           "entries": [
-                              {
-                                 "url": "http://bioshacking.blogspot.co.uk/2012/02/bios-disassembly-ninjutsu-uncovered-1st.html",
-                                 "title": "BIOS Disassembly Ninjutsu Uncovered 1st Edition"
-                              },
-                              {
-                                 "url": "https://www.nostarch.com/xboxfree/",
-                                 "title": "Hacking the Xbox: An Introduction to Reverse Engineering"
-                              },
-                              {
-                                 "url": "https://github.com/iosre/iOSAppReverseEngineering",
-                                 "title": "iOS App Reverse Engineering"
-                              },
-                              {
-                                 "url": "http://beginners.re",
-                                 "title": "Reverse Engineering for Beginners"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Search Engines",
-                           "entries": [
-                              {
-                                 "url": "https://www.elastic.co/guide/en/elasticsearch/guide/current/index.html",
-                                 "title": "Elasticsearch: The Definitive Guide"
-                              },
-                              {
-                                 "url": "https://github.com/hectorcorrea/solr-for-newbies",
-                                 "title": "Solr for newbies workshop (2019)"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Security",
-                           "entries": [
-                              {
-                                 "url": "http://toc.cryptobook.us",
-                                 "title": "A Graduate Course in Applied Cryptography"
-                              },
-                              {
-                                 "url": "https://www.crypto101.io",
-                                 "title": "Crypto 101 - Crypto for everyone"
-                              },
-                              {
-                                 "url": "https://unglue.it/work/141611/",
-                                 "title": "CryptoParty Handbook"
-                              },
-                              {
-                                 "url": "http://cacr.uwaterloo.ca/hac/index.html",
-                                 "title": "Handbook of Applied Cryptography"
-                              },
-                              {
-                                 "url": "https://howhttps.works",
-                                 "title": "How HTTPS works"
-                              },
-                              {
-                                 "url": "https://github.com/MHM5000/pass",
-                                 "title": "How to deal with Passwords"
-                              },
-                              {
-                                 "url": "http://ptgmedia.pearsoncmg.com/images/0131407333/downloads/0131407333.pdf",
-                                 "title": "Intrusion Detection Systems with Snort"
-                              },
-                              {
-                                 "url": "https://www.feistyduck.com/library/openssl-cookbook/",
-                                 "title": "OpenSSL Cookbook"
-                              },
-                              {
-                                 "url": "https://mobile-security.gitbook.io/mobile-security-testing-guide/",
-                                 "title": "OWASP Mobile Security Testing Guide"
-                              },
-                              {
-                                 "url": "https://www.owasp.org/images/1/19/OTGv4.pdf",
-                                 "title": "OWASP Testing Guide 4.0"
-                              },
-                              {
-                                 "url": "http://www.troyhunt.com/2011/12/free-ebook-owasp-top-10-for-net.html",
-                                 "title": "OWASP Top 10 for .NET Developers"
-                              },
-                              {
-                                 "url": "http://www.cl.cam.ac.uk/~rja14/book.html",
-                                 "title": "Security Engineering"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Software Architecture",
-                           "entries": [
-                              {
-                                 "url": "https://launchschool.com/books/agile_planning",
-                                 "title": "Agile Planning: From Ideas to Story Cards"
-                              },
-                              {
-                                 "url": "http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm",
-                                 "title": "Architectural Styles and the Design of Network-based Software Architectures"
-                              },
-                              {
-                                 "url": "http://smartbear.com/lp/ebook/collaborator/secrets-of-peer-code-review/",
-                                 "title": "Best Kept Secrets of Peer Code Review"
-                              },
-                              {
-                                 "url": "https://static.googleusercontent.com/media/landing.google.com/en//sre/static/pdf/Building_Secure_and_Reliable_Systems.pdf",
-                                 "title": "Building Secure & Reliable Systems"
-                              },
-                              {
-                                 "url": "http://www.dataorienteddesign.com/dodmain/dodmain.html",
-                                 "title": "Data-Oriented Design"
-                              },
-                              {
-                                 "url": "https://info.lightbend.com/COLL-20XX-Developing-Reactive-Microservices_Landing-Page.html",
-                                 "title": "Developing Reactive Microservices"
-                              },
-                              {
-                                 "url": "http://www.infoq.com/minibooks/domain-driven-design-quickly",
-                                 "title": "Domain Driven Design Quickly"
-                              },
-                              {
-                                 "url": "https://dddeurope.com/15years/",
-                                 "title": "Domain-Driven Design: The First 15 Years. Essays from the DDD community"
-                              },
-                              {
-                                 "url": "http://dslbook.org",
-                                 "title": "DSL Engineering: Designing, Implementing and Using Domain-Specific Languages"
-                              },
-                              {
-                                 "url": "https://docs.microsoft.com/en-us/previous-versions/msp-n-p/jj554200(v=pandp.10)",
-                                 "title": "Exploring CQRS and Event Sourcing"
-                              },
-                              {
-                                 "url": "https://www.computer.org/education/bodies-of-knowledge/software-engineering/v3",
-                                 "title": "Guide to the Software Engineering Body of Knowledge"
-                              },
-                              {
-                                 "url": "http://www.htdp.org",
-                                 "title": "How to Design Programs"
-                              },
-                              {
-                                 "url": "http://mindprod.com/jgloss/unmain.html",
-                                 "title": "How to Write Unmaintainable Code"
-                              },
-                              {
-                                 "url": "http://www.infoq.com/minibooks/kanban-scrum-minibook",
-                                 "title": "Kanban and Scrum - making the most of both"
-                              },
-                              {
-                                 "url": "https://leanpub.com/kanbanforskeptics",
-                                 "title": "Kanban for skeptics"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/programming/free/files/microservices-antipatterns-and-pitfalls.pdf",
-                                 "title": "Microservices AntiPatterns and Pitfalls"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/programming/free/files/microservices-vs-service-oriented-architecture.pdf",
-                                 "title": "Microservices vs. Service-Oriented Architecture"
-                              },
-                              {
-                                 "url": "https://developers.redhat.com/books/migrating-microservice-databases-relational-monolith-distributed-data/",
-                                 "title": "Migrating to Cloud-Native Application Architectures"
-                              },
-                              {
-                                 "url": "http://downloads.nakedobjects.net/resources/Pawson%20thesis.pdf",
-                                 "title": "Naked objects"
-                              },
-                              {
-                                 "url": "https://pages.apigee.com/oauth-big-picture-ebook.html",
-                                 "title": "OAuth - The Big Picture"
-                              },
-                              {
-                                 "url": "http://scg.unibe.ch/download/oorp/",
-                                 "title": "Object-Oriented Reengineering Patterns"
-                              },
-                              {
-                                 "url": "https://leanpub.com/Practicing-DDD",
-                                 "title": "Practicing Domain-Driven Design - Part 1"
-                              },
-                              {
-                                 "url": "https://www.lightbend.com/ebooks/reactive-microservices-architecture-design-principles-for-distributed-systems-oreilly",
-                                 "title": "Reactive Microservices Architecture"
-                              },
-                              {
-                                 "url": "https://www.lightbend.com/ebooks/reactive-microsystems-evolution-of-microservices-scalability-oreilly",
-                                 "title": "Reactive Microsystems: The Evolution of Microservices at Scale"
-                              },
-                              {
-                                 "url": "http://www.infoq.com/minibooks/scrum-xp-from-the-trenches-2",
-                                 "title": "Scrum and XP from the Trenches"
-                              },
-                              {
-                                 "url": "https://docs.microsoft.com/en-us/dotnet/standard/serverless-architecture/",
-                                 "title": "Serverless apps: Architecture, patterns, and Azure implementation"
-                              },
-                              {
-                                 "url": "https://www.packtpub.com/free-ebooks/serverless-design-patterns-and-best-practices",
-                                 "title": "Serverless Design Patterns and Best Practices"
-                              },
-                              {
-                                 "url": "https://basecamp.com/shapeup",
-                                 "title": "Shape Up - Stop Running in Circles and Ship Work that Matters"
-                              },
-                              {
-                                 "url": "https://landing.google.com/sre/book/index.html",
-                                 "title": "Site Reliability Engineering"
-                              },
-                              {
-                                 "url": "http://www.oreilly.com/programming/free/software-architecture-patterns.csp",
-                                 "title": "Software Architecture Patterns"
-                              },
-                              {
-                                 "url": "http://philip.greenspun.com/seia/",
-                                 "title": "Software Engineering for Internet Applications"
-                              },
-                              {
-                                 "url": "https://sourcemaking.com/design_patterns",
-                                 "title": "Source Making Design Patterns and UML"
-                              },
-                              {
-                                 "url": "https://github.com/grzesiek-galezowski/tdd-ebook",
-                                 "title": "Test Driven Development, Extensive Tutorial"
-                              },
-                              {
-                                 "url": "https://landing.google.com/sre/workbook/toc/",
-                                 "title": "The Site Reliability Workbook"
-                              },
-                              {
-                                 "url": "https://pages.apigee.com/rs/apigee/images/api-design-ebook-2012-03.pdf",
-                                 "title": "Web API Design"
-                              },
-                              {
-                                 "url": "https://launchschool.com/books/working_with_apis",
-                                 "title": "Working with Web APIs"
-                              },
-                              {
-                                 "url": "https://leanpub.com/yourapiisbad/read",
-                                 "title": "Your API Is Bad"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Standards",
-                           "entries": [
-                              {
-                                 "url": "http://refspecs.linuxfoundation.org/lsb.shtml",
-                                 "title": "Linux Standard Base"
-                              },
-                              {
-                                 "url": "https://github.com/geoff-codes/posix-standard",
-                                 "title": "UNIX - The POSIX Standard - IEEE Std 1003.1"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Theoretical Computer Science",
-                           "entries": [
-                              {
-                                 "url": "http://mfleck.cs.illinois.edu/building-blocks/index.html",
-                                 "title": "Building Blocks for Theoretical Computer Science"
-                              },
-                              {
-                                 "url": "http://www.tac.mta.ca/tac/reprints/articles/22/tr22.pdf",
-                                 "title": "Category Theory for Computing Science"
-                              },
-                              {
-                                 "url": "https://github.com/hmemcpy/milewski-ctfp-pdf",
-                                 "title": "Category Theory for Programmers"
-                              },
-                              {
-                                 "url": "https://www.smashwords.com/books/view/639609",
-                                 "title": "Design of a Programmer"
-                              },
-                              {
-                                 "url": "http://homotopytypetheory.org/book/",
-                                 "title": "Homotopy Type Theory: Univalent Foundations of Mathematics"
-                              },
-                              {
-                                 "url": "http://www.cse.iitd.ernet.in/~suban/CSL102/",
-                                 "title": "Introduction to Computer Science"
-                              },
-                              {
-                                 "url": "http://www.computingbook.org",
-                                 "title": "Introduction to Computing"
-                              },
-                              {
-                                 "url": "http://cglab.ca/~michiel/TheoryOfComputation/",
-                                 "title": "Introduction to Theory of Computation"
-                              },
-                              {
-                                 "url": "http://cs.brown.edu/people/jes/book/",
-                                 "title": "Models of Computation"
-                              },
-                              {
-                                 "url": "https://www.cs.cmu.edu/~rwh/pfpl/2nded.pdf",
-                                 "title": "Practical Foundations for Programming Languages, Preview"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20150418034451/http://www.cs.jhu.edu/~scott/pl/book/dist/",
-                                 "title": "Principles of Programming Languages"
-                              },
-                              {
-                                 "url": "https://papl.cs.brown.edu/2019/",
-                                 "title": "Programming and Programming Languages"
-                              },
-                              {
-                                 "url": "http://www.cse.chalmers.se/research/group/logic/book/",
-                                 "title": "Programming in Martin-Löf's Type Theory"
-                              },
-                              {
-                                 "url": "http://cs.brown.edu/~sk/Publications/Books/ProgLangs/",
-                                 "title": "Programming Languages: Application and Interpretation (2nd Edition)"
-                              },
-                              {
-                                 "url": "http://people.cs.uchicago.edu/~blume/classes/aut2008/proglang/text/offline.pdf",
-                                 "title": "Programming Languages: Theory and Practice"
-                              },
-                              {
-                                 "url": "http://www.cs.ru.nl/~herman/onderwijs/semantics2019/wiley.pdf",
-                                 "title": "Semantics with Applications: A Formal Introduction"
-                              },
-                              {
-                                 "url": "https://mitpress.mit.edu/sicp/",
-                                 "title": "Structure and Interpretation of Computer Programs"
-                              },
-                              {
-                                 "url": "http://sarabander.github.io/sicp/html/index.xhtml",
-                                 "title": "Structure and Interpretation of Computer Programs"
-                              },
-                              {
-                                 "url": "http://self.gutenberg.org/wplbn0002828847-the-black-art-of-programming-by-mcilroy-mark.aspx?",
-                                 "title": "The Black Art of Programming"
-                              },
-                              {
-                                 "url": "https://kilthub.cmu.edu/articles/The_Craft_of_Programming/6610514",
-                                 "title": "The Craft of Programming"
-                              },
-                              {
-                                 "url": "https://greenteapress.com/wp/think-complexity-2e/",
-                                 "title": "Think Complexity"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Web Performance",
-                           "entries": [
-                              {
-                                 "url": "http://www.bookofspeed.com",
-                                 "title": "Book of Speed"
-                              },
-                              {
-                                 "url": "http://designingforperformance.com",
-                                 "title": "Designing for Performance"
-                              },
-                              {
-                                 "url": "https://thisisyuu.github.io/ebook",
-                                 "title": "High Performance Accelerated Websites"
-                              },
-                              {
-                                 "url": "https://hpbn.co",
-                                 "title": "High Performance Browser Networking"
-                              },
-                              {
-                                 "url": "http://carlos.bueno.org/optimization/mature-optimization.pdf",
-                                 "title": "Mature Optimization"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "ABAP",
-                     "entries": [
-                        {
-                           "url": "https://github.com/SAP/styleguides/blob/master/clean-abap/CleanABAP.md",
-                           "title": "SAP Code Style Guides - Clean ABAP"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ada",
-                     "entries": [
-                        {
-                           "url": "http://www.cs.uni.edu/~mccormic/4740/guide-c2ada.pdf",
-                           "title": "A Guide to Ada for C and C++ Programmers"
-                        },
-                        {
-                           "url": "http://www.adapower.com/pdfs/AdaDistilled07-27-2003.pdf",
-                           "title": "Ada Distilled"
-                        },
-                        {
-                           "url": "https://www.adacore.com/uploads/books/pdf/Ada_for_the_C_or_Java_Developer-cc.pdf",
-                           "title": "Ada for the C++ or Java Developer"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Ada_Programming",
-                           "title": "Ada Programming"
-                        },
-                        {
-                           "url": "http://www.ada-auth.org/standards/12rm/RM-Final.pdf",
-                           "title": "Ada Reference Manual - ISO/IEC 8652:2012(E) Language and Standard Libraries"
-                        },
-                        {
-                           "url": "https://learn.adacore.com/courses/intro-to-ada/index.html",
-                           "title": "Introduction To Ada"
-                        },
-                        {
-                           "url": "https://learn.adacore.com/courses/SPARK_for_the_MISRA_C_Developer/index.html",
-                           "title": "Introduction To SPARK"
-                        },
-                        {
-                           "url": "http://www.pegasoft.ca/resources/boblap/book.html",
-                           "title": "The Big Online Book of Linux Ada Programming"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Agda",
-                     "entries": [
-                        {
-                           "url": "http://people.inf.elte.hu/divip/AgdaTutorial/Index.html",
-                           "title": "Agda Tutorial"
-                        },
-                        {
-                           "url": "https://plfa.github.io",
-                           "title": "Programming Language Foundations in Agda"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Alef",
-                     "entries": [
-                        {
-                           "url": "http://doc.cat-v.org/plan_9/2nd_edition/papers/alef/ref",
-                           "title": "Alef Language Reference Manual"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Android",
-                     "entries": [
-                        {
-                           "url": "http://www.techotopia.com/index.php/Android_4_App_Development_Essentials",
-                           "title": "Android 4 App Development Essentials"
-                        },
-                        {
-                           "url": "https://goalkicker.com/AndroidBook",
-                           "title": "Android Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/android",
-                           "title": "Android Programming Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://www.tutorialspoint.com/android",
-                           "title": "Android Tutorial"
-                        },
-                        {
-                           "url": "https://developer.android.com/courses/advanced-training/toc",
-                           "title": "Codelabs for Advanced Android Development"
-                        },
-                        {
-                           "url": "https://github.com/codepath/android_guides/wiki",
-                           "title": "CodePath Android Cliffnotes"
-                        },
-                        {
-                           "url": "http://www.coreservlets.com/android-tutorial/",
-                           "title": "Coreservlets Android Programming Tutorial"
-                        },
-                        {
-                           "url": "http://www.vogella.com/tutorials/android.html",
-                           "title": "Expert Android and Eclipse development knowledge"
-                        },
-                        {
-                           "url": "https://developer.android.com/guide",
-                           "title": "Google Android Developer Training"
-                        },
-                        {
-                           "url": "https://blog.stylingandroid.com",
-                           "title": "Styling Android"
-                        },
-                        {
-                           "url": "https://commonsware.com/Android/4-2-free",
-                           "title": "The Busy Coder's Guide to Android Development"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "APL",
-                     "entries": [
-                        {
-                           "url": "http://robertson.uk.net",
-                           "title": "A Practical Introduction to APL1 & APL2"
-                        },
-                        {
-                           "url": "http://robertson.uk.net",
-                           "title": "A Practical Introduction to APL3 & APL4"
-                        },
-                        {
-                           "url": "http://www.softwarepreservation.org/projects/apl/Books/CollegeMathematicswithAPL",
-                           "title": "Introduction to College Mathematics with A Programming Language (1978)"
-                        },
-                        {
-                           "url": "http://www.dyalog.com/mastering-dyalog-apl.htm",
-                           "title": "Mastering Dyalog APL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "App Inventor",
-                     "entries": [
-                        {
-                           "url": "https://amerkashi.wordpress.com/2015/02/16/absolute-app-inventor-2-book/",
-                           "title": "Absolute App Inventor 2"
-                        },
-                        {
-                           "url": "http://www.appinventor.org/book2",
-                           "title": "App Inventor 2"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Arduino",
-                     "entries": [
-                        {
-                           "url": "https://unglue.it/work/152452",
-                           "title": "Arduino Programming Notebook"
-                        },
-                        {
-                           "url": "https://cdn-learn.adafruit.com/downloads/pdf/arduino-tips-tricks-and-techniques.pdf",
-                           "title": "Arduino Tips, Tricks, and Techniques"
-                        },
-                        {
-                           "url": "http://manuals.makeuseof.com.s3.amazonaws.com/for-mobile/Arduino_-_MakeUseOf.com.pdf",
-                           "title": "Getting started with Arduino – A Beginner’s Guide"
-                        },
-                        {
-                           "url": "https://www.arduino.cc/en/Guide",
-                           "title": "Getting Started with Arduino products"
-                        },
-                        {
-                           "url": "http://playground.arduino.cc/Main/ManualsAndCurriculum",
-                           "title": "Introduction to Arduino"
-                        },
-                        {
-                           "url": "http://www.introtoarduino.com",
-                           "title": "Introduction to Arduino : A piece of cake!"
-                        },
-                        {
-                           "url": "https://openlibra.com/en/book/download/open-softwear-fashionable-prototyping-and-wearable-computing-using-the-arduino",
-                           "title": "Open softwear - Fashionable prototyping and wearable computing using the Arduino"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "ASP.NET",
-                     "entries": [
-                        {
-                           "url": "https://aka.ms/webappebook",
-                           "title": "Architecting Modern Web Applications with ASP.NET Core and Microsoft Azure (2020)"
-                        },
-                        {
-                           "url": "http://mvcmusicstore.codeplex.com",
-                           "title": "ASP.NET MVC Music Store"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/aspnet_webhooks_succinctly",
-                           "title": "ASP.NET WebHooks Succinctly"
-                        },
-                        {
-                           "url": "http://www.vijaymukhi.com/documents/books/vsnet/content.htm",
-                           "title": "ASP.NET with C# (2008)"
-                        },
-                        {
-                           "url": "https://github.com/akhilmittal/FreeBooks/",
-                           "title": "Diving into ASP.NET WebAPI (2016)"
-                        },
-                        {
-                           "url": "http://download.microsoft.com/download/0/f/b/0fbfaa46-2bfd-478f-8e56-7bf3c672df9d/intro%20to%20asp.net%20mvc%204%20with%20visual%20studio%20-%20beta.pdf",
-                           "title": "Intro to ASPNET MVC 4 with Visual Studio 2011 Beta (2012)"
-                        },
-                        {
-                           "url": "https://download.microsoft.com/download/0/F/B/0FBFAA46-2BFD-478F-8E56-7BF3C672DF9D/Introducing%20ASP.NET%20Web%20Pages%202.pdf",
-                           "title": "Introducing ASP.NET Web Pages 2 (2012)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "ASP.NET Core",
-                     "entries": [
-                        {
-                           "url": "https://www.syncfusion.com/succinctly-free-ebooks/asp-net-core-3-1-succinctly",
-                           "title": "ASP.NET Core 3.1 Succinctly"
-                        },
-                        {
-                           "url": "https://docs.microsoft.com/en-us/aspnet/core/?view=aspnetcore-5.0",
-                           "title": "ASP.NET Core Documentation - Microsoft Docs"
-                        },
-                        {
-                           "url": "https://s3.amazonaws.com/recaffeinate-files/LittleAspNetCoreBook.pdf",
-                           "title": "The Little ASP.NET Core Book (2018)"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Blazor",
-                           "entries": [
-                              {
-                                 "url": "https://www.telerik.com/campaigns/blazor/wp-beginners-guide-ebook",
-                                 "title": "Blazor: A Beginner's Guide"
-                              },
-                              {
-                                 "url": "https://dotnet.microsoft.com/download/e-book/blazor-for-web-forms-devs/pdf",
-                                 "title": "Blazor for ASP.NET Web Forms Developers"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Assembly Language",
-                     "entries": [
-                        {
-                           "url": "http://www.rigwit.co.uk/ARMBook/ARMBook.pdf",
-                           "title": "ARM Assembly Language Programming"
-                        },
-                        {
-                           "url": "http://www.davidsalomon.name/assem.advertis/asl.pdf",
-                           "title": "Assemblers And Loaders (1993)"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/details/ebooks/assemblylanguage",
-                           "title": "Assembly Language Succinctly"
-                        },
-                        {
-                           "url": "http://pacman128.github.io/pcasm/",
-                           "title": "PC Assembly Language"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170329045538/http://blog.hit.edu.cn:80/jsx/upload/AT%EF%BC%86TAssemblyLanguage.pdf",
-                           "title": "Professional Assembly Language"
-                        },
-                        {
-                           "url": "https://download-mirror.savannah.gnu.org/releases/pgubook/ProgrammingGroundUp-1-0-booksize.pdf",
-                           "title": "Programming from the Ground Up"
-                        },
-                        {
-                           "url": "http://www.ctyme.com/rbrown.htm",
-                           "title": "Ralf Brown's Interrupt List"
-                        },
-                        {
-                           "url": "http://www.agner.org/optimize/",
-                           "title": "Software optimization resources"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20120525102637/http://maven.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html",
-                           "title": "The Art of Assembly Language (2003)"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170712195930/http://vendu.twodots.nl/files/wizardcode4.pdf",
-                           "title": "Wizard Code, A View on Low-Level Programming"
-                        },
-                        {
-                           "url": "http://www.egr.unlv.edu/~ed/x86.html",
-                           "title": "x86-64 Assembly Language Programming with Ubuntu"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/X86_Assembly",
-                           "title": "x86 Assembly"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/X86_Disassembly",
-                           "title": "x86 Disassembly"
-                        },
-                        {
-                           "url": "http://www.jagregory.com/abrash-zen-of-asm/",
-                           "title": "Zen of Assembly Language: Volume I, Knowledge (1990)"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Non-X86",
-                           "entries": [
-                              {
-                                 "url": "http://skilldrick.github.io/easy6502/",
-                                 "title": "Easy 6502"
-                              },
-                              {
-                                 "url": "https://usborne.com/browse-books/features/computer-and-coding-books/",
-                                 "title": "Machine Code for Beginners [Z80 and 6502 CPUs]"
-                              },
-                              {
-                                 "url": "https://archive.org/details/ataribooks-machine-language-for-beginners",
-                                 "title": "Machine Language for Beginners"
-                              },
-                              {
-                                 "url": "http://chortle.ccsu.edu/AssemblyTutorial/index.html",
-                                 "title": "Programmed Introduction to MIPS Assembly Language"
-                              },
-                              {
-                                 "url": "http://www.atariarchives.org/2bml/",
-                                 "title": "The Second Book of Machine Language"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "AutoHotkey",
-                     "entries": [
-                        {
-                           "url": "http://ahkscript.github.io/ahkbook/index.html",
-                           "title": "AHKbook - the book for AutoHotkey"
-                        },
-                        {
-                           "url": "https://autohotkey.com/docs/AutoHotkey.htm",
-                           "title": "AutoHotkey Official Documentation"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "AutoIt",
-                     "entries": [
-                        {
-                           "url": "https://www.autoitscript.com/autoit3/docs/",
-                           "title": "AutoIt Docs"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Autotools",
-                     "entries": [
-                        {
-                           "url": "https://autotools.io/index.html",
-                           "title": "Autotools Mythbuster"
-                        },
-                        {
-                           "url": "http://sourceware.org/autobook/",
-                           "title": "GNU Autoconf, Automake and Libtool"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Awk",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/An_Awk_Primer",
-                           "title": "An Awk Primer"
-                        },
-                        {
-                           "url": "https://www.grymoire.com/Unix/Awk.html",
-                           "title": "Awk"
-                        },
-                        {
-                           "url": "https://www.gnu.org/software/gawk/manual",
-                           "title": "Gawk: Effective AWK Programming"
-                        },
-                        {
-                           "url": "https://learnbyexample.github.io/learn_gnuawk/",
-                           "title": "GNU awk"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Bash",
-                     "entries": [
-                        {
-                           "url": "http://tldp.org/LDP/abs/html/",
-                           "title": "Advanced Bash-Scripting Guide"
-                        },
-                        {
-                           "url": "http://www.tldp.org/LDP/Bash-Beginners-Guide/html/",
-                           "title": "Bash Guide for Beginners (2008)"
-                        },
-                        {
-                           "url": "http://goalkicker.com/BashBook/",
-                           "title": "Bash Notes for Professionals"
-                        },
-                        {
-                           "url": "http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html",
-                           "title": "BASH Programming (2000)"
-                        },
-                        {
-                           "url": "http://www.gnu.org/software/bash/manual/bashref.html",
-                           "title": "Bash Reference Manual"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180328183806/http://gdrcorelec.ups-tlse.fr/files/bash.pdf",
-                           "title": "Bash tutorial"
-                        },
-                        {
-                           "url": "http://mywiki.wooledge.org/BashGuide",
-                           "title": "BashGuide"
-                        },
-                        {
-                           "url": "http://conqueringthecommandline.com/book/frontmatter",
-                           "title": "Conquering the Command Line"
-                        },
-                        {
-                           "url": "http://www.hypexr.org/bash_tutorial.php",
-                           "title": "Getting Started with BASH"
-                        },
-                        {
-                           "url": "https://www.gnu.org/software/bash/manual/bash.pdf",
-                           "title": "GNU Bash manual"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/shell.xml",
-                           "title": "Google Shell Style Guide"
-                        },
-                        {
-                           "url": "https://github.com/bobbyiliev/introduction-to-bash-scripting",
-                           "title": "Introduction to Bash Scripting"
-                        },
-                        {
-                           "url": "https://launchschool.com/books/command_line",
-                           "title": "Introduction to the Command Line"
-                        },
-                        {
-                           "url": "http://www.freeos.com/guides/lsst/",
-                           "title": "Linux Shell Scripting Tutorial - A Beginner's Handbook (2002)"
-                        },
-                        {
-                           "url": "https://bash.cyberciti.biz/guide/Main_Page",
-                           "title": "Linux Shell Scripting Tutorial (LSST) v2.0"
-                        },
-                        {
-                           "url": "http://slackbook.org",
-                           "title": "Slackbook (2005)"
-                        },
-                        {
-                           "url": "http://guide.bash.academy",
-                           "title": "The Bash Academy"
-                        },
-                        {
-                           "url": "http://linuxcommand.org/tlcl.php",
-                           "title": "The Linux Command Line"
-                        },
-                        {
-                           "url": "http://linuxcommand.org/lc3_writing_shell_scripts.php",
-                           "title": "Writing Shell Scripts"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Basic",
-                     "entries": [
-                        {
-                           "url": "http://10print.org",
-                           "title": "10 PRINT CHR$(205.5+RND(1)); : GOTO 10"
-                        },
-                        {
-                           "url": "http://distro.ibiblio.org/vectorlinux/Uelsk8s/GAMBAS/gambas-beginner-guide.pdf",
-                           "title": "A beginner's guide to Gambas"
-                        },
-                        {
-                           "url": "http://www.jes.com/pb/",
-                           "title": "Pick/Basic: A Programmer's Guide"
-                        },
-                        {
-                           "url": "http://www.techotopia.com/index.php/Visual_Basic_Essentials",
-                           "title": "Visual Basic Essentials"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "BETA",
-                     "entries": [
-                        {
-                           "url": "https://beta.cs.au.dk/Manuals/latest/compiler/index.html",
-                           "title": "MIA 90-02: BETA Compiler - Reference Manual"
-                        },
-                        {
-                           "url": "https://beta.cs.au.dk/Manuals/latest/beta-intro/index.html",
-                           "title": "MIA 94-26: BETA Language Introduction - Tutorial"
-                        },
-                        {
-                           "url": "https://beta.cs.au.dk/Manuals/latest/beta/beta-index.html",
-                           "title": "MIA 99-41: BETA Language Modifications - Reference Manual"
-                        },
-                        {
-                           "url": "https://beta.cs.au.dk/Manuals/latest/beta/fragment.html",
-                           "title": "MIA 99-42: The Fragment System: Further Specification"
-                        },
-                        {
-                           "url": "https://beta.cs.au.dk/Books/",
-                           "title": "Object-Oriented Programming in the BETA Programming Language"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C",
-                     "entries": [
-                        {
-                           "url": "http://www.brackeen.com/vga/",
-                           "title": "256-Color VGA Programming in C"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180827131006/http://home.earthlink.net/~momotuk/pointers.pdf",
-                           "title": "A Tutorial on Pointers and Arrays in C"
-                        },
-                        {
-                           "url": "https://www.raspberrypi.org/magpi-issues/C_GUI_Programming.pdf",
-                           "title": "An Introduction to C & GUI Programming"
-                        },
-                        {
-                           "url": "https://github.com/umanovskis/baremetal-arm",
-                           "title": "Bare-metal programming for ARM"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bgc/",
-                           "title": "Beej's Guide to C Programming"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bgnet/",
-                           "title": "Beej's Guide to Network Programming - Using Internet Sockets"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bggdb/",
-                           "title": "Beej's Guide to the GNU Debugger (GDB)"
-                        },
-                        {
-                           "url": "http://www.buildyourownlisp.com",
-                           "title": "Build Your Own Lisp"
-                        },
-                        {
-                           "url": "http://www.oualline.com/books.free/style/",
-                           "title": "C Elements of Style"
-                        },
-                        {
-                           "url": "http://www.toves.org/books/cpy/",
-                           "title": "C for Python Programmers - Carl Burch"
-                        },
-                        {
-                           "url": "https://goalkicker.com/CBook",
-                           "title": "C Notes for Professionals"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Programming%3AC",
-                           "title": "C Programming"
-                        },
-                        {
-                           "url": "https://gribblelab.org/teaching/CBootCamp/",
-                           "title": "C Programming Boot Camp - Paul Gribble"
-                        },
-                        {
-                           "url": "http://www.slideshare.net/olvemaudal/deep-c",
-                           "title": "Deep C"
-                        },
-                        {
-                           "url": "http://cslibrary.stanford.edu/101/EssentialC.pdf",
-                           "title": "Essential C"
-                        },
-                        {
-                           "url": "http://boredzo.org/pointers/",
-                           "title": "Everything you need to know about pointers in C - Peter Hosey"
-                        },
-                        {
-                           "url": "https://research.utwente.nl/files/5128727/book.pdf",
-                           "title": "Functional C (1997)"
-                        },
-                        {
-                           "url": "https://www.smashwords.com/books/view/737188",
-                           "title": "Hashing"
-                        },
-                        {
-                           "url": "https://www.raspberrypi.org/magpi-issues/Essentials_C_v1.pdf",
-                           "title": "Learn to Code With C - The MagPi Essentials"
-                        },
-                        {
-                           "url": "https://download-mirror.savannah.gnu.org/releases/c-prog-book/learning_gnu_c.pdf",
-                           "title": "Learning GNU C"
-                        },
-                        {
-                           "url": "https://ben.klemens.org/pdfs/gsl_stats.pdf",
-                           "title": "Modeling with Data"
-                        },
-                        {
-                           "url": "https://modernc.gforge.inria.fr",
-                           "title": "Modern C"
-                        },
-                        {
-                           "url": "http://www.planetpdf.com/codecuts/pdfs/ooc.pdf",
-                           "title": "Object-Oriented Programming With ANSI-C"
-                        },
-                        {
-                           "url": "http://ee.hawaii.edu/~tep/EE160/Book/PDF/",
-                           "title": "Programming in C"
-                        },
-                        {
-                           "url": "https://www.freetechbooks.com/programming-in-c-t1337.html",
-                           "title": "Programming in C"
-                        },
-                        {
-                           "url": "https://www.smashwords.com/books/view/644937",
-                           "title": "Structures and C"
-                        },
-                        {
-                           "url": "http://publications.gbdirect.co.uk/c_book/",
-                           "title": "The C book"
-                        },
-                        {
-                           "url": "http://www.finseth.com/craft/",
-                           "title": "The Craft of Text Editing or A Cookbook for an Emacs"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20181230041359/http://www.open-std.org/jtc1/sc22/wg14/www/abq/c17_updated_proposed_fdis.pdf",
-                           "title": "The Current C Programming Language Standard – ISO/IEC 9899:2018 (C17/C18), Draft"
-                        },
-                        {
-                           "url": "http://www.crasseux.com/books/ctut.pdf",
-                           "title": "The GNU C Programming Tutorial"
-                        },
-                        {
-                           "url": "https://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html",
-                           "title": "The GNU C Reference Manual"
-                        },
-                        {
-                           "url": "http://littleosbook.github.io",
-                           "title": "The little book about OS development"
-                        },
-                        {
-                           "url": "http://www.knosof.co.uk/cbook/cbook.html",
-                           "title": "The New C Standard - An Economic and Cultural commentary (2009)"
-                        },
-                        {
-                           "url": "http://www.coranac.com/tonc/text/toc.htm",
-                           "title": "TONC GBA Programming - Game Boy Advance Development"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "C Sharp",
-                     "entries": [
-                        {
-                           "url": "http://www.techotopia.com/index.php/C_Sharp_Essentials",
-                           "title": "C# Essentials"
-                        },
-                        {
-                           "url": "http://goalkicker.com/CSharpBook/",
-                           "title": "C# Notes for Professionals"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/C_Sharp_Programming",
-                           "title": "C# Programming"
-                        },
-                        {
-                           "url": "https://www.robmiles.com/s/CSharp-Book-2019-Refresh.pdf",
-                           "title": "C# Programming Yellow Book"
-                        },
-                        {
-                           "url": "https://www.filipekberg.se",
-                           "title": "C# Smorgasbord"
-                        },
-                        {
-                           "url": "https://leanpub.com/cstips",
-                           "title": "C# Tips"
-                        },
-                        {
-                           "url": "https://developer.xamarin.com/guides/xamarin-forms/creating-mobile-apps-xamarin-forms/",
-                           "title": "Creating Mobile Apps with Xamarin.Forms C#"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170930132000/https://www.exceptionnotfound.net/downloads/dailydesignpattern.pdf",
-                           "title": "Daily Design Patterns"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20161220072449/http://www.brpreiss.com/books/opus6/",
-                           "title": "Data Structures and Algorithms with Object-Oriented Design Patterns in C#"
-                        },
-                        {
-                           "url": "https://damieng.com/blog/2007/11/08/dissecting-a-c-application-inside-sharpdevelop",
-                           "title": "Dissecting a C# Application"
-                        },
-                        {
-                           "url": "http://www.introprogramming.info/english-intro-csharp-book/read-online/",
-                           "title": "Fundamentals of Computer Programming with C#"
-                        },
-                        {
-                           "url": "https://github.com/petroemil/Rx.Book",
-                           "title": "High level asynchronous programming with Reactive Extensions"
-                        },
-                        {
-                           "url": "http://www.introtorx.com",
-                           "title": "Introduction to Rx"
-                        },
-                        {
-                           "url": "https://learnxinyminutes.com/docs/csharp/",
-                           "title": "Learn C# in Y Minutes"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/mastering-xamarin-ui-development-second-edition",
-                           "title": "Mastering Xamarin UI Development, Second Edition"
-                        },
-                        {
-                           "url": "http://bookboon.com/en/object-oriented-programming-using-c-sharp-ebook",
-                           "title": "Object Oriented Programming using C#"
-                        },
-                        {
-                           "url": "http://www.albahari.com/threading/",
-                           "title": "Threading in C#"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/xamarin_forms_for_mac_os_succinctly",
-                           "title": "Xamarin.Forms for macOS Succinctly"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/xamarin-forms-succinctly",
-                           "title": "Xamarin.Forms Succinctly"
-                        },
-                        {
-                           "url": "https://fbb-git.gitlab.io/cppannotations/",
-                           "title": "C++ Annotations"
-                        },
-                        {
-                           "url": "https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md",
-                           "title": "C++ Core Guidelines"
-                        },
-                        {
-                           "url": "https://ptgmedia.pearsoncmg.com/images/0131240722/downloads/blanchette_book.pdf",
-                           "title": "C++ GUI Programming With Qt 3"
-                        },
-                        {
-                           "url": "http://www.cplusplus.com/doc/tutorial/",
-                           "title": "C++ Language"
-                        },
-                        {
-                           "url": "https://goalkicker.com/CPlusPlusBook",
-                           "title": "C++ Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/cplusplus",
-                           "title": "C++ Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://www.bordoon.com/cplusplus/book_wrapper.html",
-                           "title": "C++ Tricks"
-                        },
-                        {
-                           "url": "http://web.stanford.edu/class/cs106x/",
-                           "title": "CS106X Programming Abstractions in C++"
-                        },
-                        {
-                           "url": "http://elementsofprogramming.com",
-                           "title": "Elements of Programming"
-                        },
-                        {
-                           "url": "http://finance.bi.no/~bernt/gcc_prog/recipes/",
-                           "title": "Financial Numerical Recipes in C++"
-                        },
-                        {
-                           "url": "http://gameprogrammingpatterns.com",
-                           "title": "Game Programming Patterns"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/cppguide.html",
-                           "title": "Google's C++ Style Guide"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebook/hands-on-system-programming-with-c/9781789137880",
-                           "title": "Hands-On System Programming with C++"
-                        },
-                        {
-                           "url": "https://samypesse.gitbook.io/how-to-create-an-operating-system/",
-                           "title": "How to make an Operating System"
-                        },
-                        {
-                           "url": "http://greenteapress.com/thinkcpp/index.html",
-                           "title": "How To Think Like a Computer Scientist: C++ Version"
-                        },
-                        {
-                           "url": "http://ptgmedia.pearsoncmg.com/images/9780131879058/downloads/0131879057_Ezust_book.pdf",
-                           "title": "Introduction to Design Patterns in C++ with Qt 4"
-                        },
-                        {
-                           "url": "http://www.stroustrup.com/JSF-AV-rules.pdf",
-                           "title": "Joint Strike Fighter, C++ Coding Standards, by Bjarne Stroustrup"
-                        },
-                        {
-                           "url": "https://www.learncpp.com",
-                           "title": "LearnCpp.com"
-                        },
-                        {
-                           "url": "http://www.jjj.de/fxt/fxtbook.pdf",
-                           "title": "Matters Computational: Ideas, Algorithms, Source Code, by Jorg Arndt"
-                        },
-                        {
-                           "url": "http://opendatastructures.org/ods-cpp.pdf",
-                           "title": "Open Data Structures (In C++)"
-                        },
-                        {
-                           "url": "https://learning.hccs.edu/faculty/ken.busbee/programming-fundamentals-a-modular-structured-approach-using-c",
-                           "title": "Programming Fundamentals - A Modular Structured Approach using C++"
-                        },
-                        {
-                           "url": "http://cis.stvincent.edu/html/tutorials/swd/",
-                           "title": "Software Design Using C++"
-                        },
-                        {
-                           "url": "http://www.agner.org/optimize/",
-                           "title": "Software optimization resources by Agner Fog"
-                        },
-                        {
-                           "url": "http://theboostcpplibraries.com",
-                           "title": "The Boost C++ libraries"
-                        },
-                        {
-                           "url": "http://rooksguide.org/2013/11/26/version-1-0-is-out/",
-                           "title": "The Rook's Guide to C++"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/alexastva/the-ultimate-question-of-programming-refactoring-/details",
-                           "title": "The Ultimate Question of Programming, Refactoring, and Everything"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/think-c/",
-                           "title": "Think C++: How To Think Like a Computer Scientist"
-                        },
-                        {
-                           "url": "https://archive.org/details/TICPP2ndEdVolOne",
-                           "title": "Thinking in C++, Second Edition, Vol. 1."
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Chapel",
-                     "entries": [
-                        {
-                           "url": "http://faculty.knox.edu/dbunde/teaching/chapel/",
-                           "title": "Chapel Tutorial"
-                        },
-                        {
-                           "url": "http://web.archive.org/web/20150310075109/http://cs.colby.edu/kgburke/?resource=chapelTutorial",
-                           "title": "Chapel Tutorial for Programmers"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Cilk",
-                     "entries": [
-                        {
-                           "url": "http://supertech.csail.mit.edu/cilk/manual-5.4.6.pdf",
-                           "title": "Cilk 5.4.6 Reference Manual"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Clojure",
-                     "entries": [
-                        {
-                           "url": "http://www.unexpected-vortices.com/clojure/brief-beginners-guide/",
-                           "title": "A Brief Beginner’s Guide To Clojure"
-                        },
-                        {
-                           "url": "http://java.ociweb.com/mark/clojure/article.html",
-                           "title": "Clojure - Functional Programming for the JVM"
-                        },
-                        {
-                           "url": "https://kimh.github.io/clojure-by-example/",
-                           "title": "Clojure by Example"
-                        },
-                        {
-                           "url": "http://clojure-doc.org",
-                           "title": "Clojure community-driven documentation"
-                        },
-                        {
-                           "url": "https://github.com/clojure-cookbook/clojure-cookbook",
-                           "title": "Clojure Cookbook"
-                        },
-                        {
-                           "url": "http://yogthos.github.io/ClojureDistilled.html",
-                           "title": "Clojure Distilled Beginner Guide"
-                        },
-                        {
-                           "url": "http://www.braveclojure.com",
-                           "title": "Clojure for the Brave and True"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20201013022918/http://daly.axiom-developer.org/clojure.pdf",
-                           "title": "Clojure in Small Pieces"
-                        },
-                        {
-                           "url": "http://clojurekoans.com",
-                           "title": "Clojure Koans"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Clojure_Programming",
-                           "title": "Clojure Programming"
-                        },
-                        {
-                           "url": "http://clojurescriptkoans.com",
-                           "title": "ClojureScript Koans"
-                        },
-                        {
-                           "url": "https://funcool.github.io/clojurescript-unraveled/",
-                           "title": "ClojureScript Unraveled"
-                        },
-                        {
-                           "url": "http://data-sorcery.org/contents/",
-                           "title": "Data Sorcery with Clojure"
-                        },
-                        {
-                           "url": "https://github.com/magomimmo/modern-cljs",
-                           "title": "Modern cljs"
-                        },
-                        {
-                           "url": "http://www.sicpdistilled.com",
-                           "title": "SICP Distilled - An idiosyncratic tour of SICP in Clojure"
-                        },
-                        {
-                           "url": "https://github.com/bbatsov/clojure-style-guide",
-                           "title": "The Clojure Style Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "COBOL",
-                     "entries": [
-                        {
-                           "url": "http://yusman.staff.gunadarma.ac.id/Downloads/files/33460/COBOL_Programming_Fundamental.pdf",
-                           "title": "COBOL Programming Fundamental"
-                        },
-                        {
-                           "url": "http://www-01.ibm.com/support/docview.wss?uid=swg27036733",
-                           "title": "Enterprise COBOL for z/OS documentation library"
-                        },
-                        {
-                           "url": "https://supportline.microfocus.com/documentation/books/oc41books/lrintr.htm",
-                           "title": "Introduction to the COBOL Language"
-                        },
-                        {
-                           "url": "http://open-cobol.sourceforge.net/guides/OpenCOBOL%20Programmers%20Guide.pdf",
-                           "title": "OpenCOBOL 1.1 - Programmer's Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CoffeeScript",
-                     "entries": [
-                        {
-                           "url": "https://coffeescript-cookbook.github.io",
-                           "title": "CoffeeScript Cookbook"
-                        },
-                        {
-                           "url": "https://leanpub.com/coffeescript-ristretto/read",
-                           "title": "CoffeeScript Ristretto"
-                        },
-                        {
-                           "url": "http://autotelicum.github.io/Smooth-CoffeeScript/SmoothCoffeeScript.html",
-                           "title": "Smooth CoffeeScript"
-                        },
-                        {
-                           "url": "http://arcturo.github.io/library/coffeescript/",
-                           "title": "The Little Book on CoffeeScript"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "ColdFusion",
-                     "entries": [
-                        {
-                           "url": "https://github.com/mhenke/CFML-in-100-minutes/blob/master/cfml100mins.markdown",
-                           "title": "CFML In 100 Minutes"
-                        },
-                        {
-                           "url": "http://learncfinaweek.com",
-                           "title": "Learn CF in a Week"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Component Pascal",
-                     "entries": [
-                        {
-                           "url": "http://www.cslab.pepperdine.edu/warford/ComputingFundamentals/",
-                           "title": "Computing Fundamentals"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Cool",
-                     "entries": [
-                        {
-                           "url": "https://www.eecis.udel.edu/~cavazos/cisc672/docs/cool-manual.pdf",
-                           "title": "CoolAid: The Cool 2013 Reference Manual"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Coq",
-                     "entries": [
-                        {
-                           "url": "http://adam.chlipala.net/cpdt/html/toc.html",
-                           "title": "Certified Programming with Dependent Types"
-                        },
-                        {
-                           "url": "http://www.cis.upenn.edu/~bcpierce/sf/",
-                           "title": "Software Foundations"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Crystal",
-                     "entries": [
-                        {
-                           "url": "http://www.crystalforrubyists.com",
-                           "title": "Crystal for Rubyists"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "CUDA",
-                     "entries": [
-                        {
-                           "url": "https://docs.nvidia.com/pdf/CUDA_C_Best_Practices_Guide.pdf",
-                           "title": "CUDA C Best Practices Guide"
-                        },
-                        {
-                           "url": "https://docs.nvidia.com/pdf/CUDA_C_Programming_Guide.pdf",
-                           "title": "CUDA C Programming Guide"
-                        },
-                        {
-                           "url": "http://www.nvidia.com/content/cudazone/download/OpenCL/NVIDIA_OpenCL_ProgrammingGuide.pdf",
-                           "title": "OpenCL Programming Guide for CUDA Architecture"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "D",
-                     "entries": [
-                        {
-                           "url": "https://github.com/PhilippeSigaud/D-templates-tutorial",
-                           "title": "D Templates Tutorial"
-                        },
-                        {
-                           "url": "http://ddili.org/ders/d.en/",
-                           "title": "Programming in D"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Dart",
-                     "entries": [
-                        {
-                           "url": "https://riptutorial.com/Download/dart.pdf",
-                           "title": "Learning Dart"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "DB2",
-                     "entries": [
-                        {
-                           "url": "http://public.dhe.ibm.com/software/dw/db2/express-c/wiki/Getting_Started_with_DB2_Express_v9.7_p4.pdf",
-                           "title": "Getting started with DB2 Express-C"
-                        },
-                        {
-                           "url": "http://public.dhe.ibm.com/software/dw/db2/express-c/wiki/Getting_Started_with_IBM_Data_Studio_for_DB2_p3.pdf",
-                           "title": "Getting started with IBM Data Studio for DB2"
-                        },
-                        {
-                           "url": "http://public.dhe.ibm.com/software/dw/db2/express-c/wiki/Getting_Started_with_DB2_App_Dev_p2.pdf",
-                           "title": "Getting started with IBM DB2 development"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "DBMS",
-                     "entries": [
-                        {
-                           "url": "http://www.lincoste.com/ebooks/english/pdf/computers/database_management_systems.pdf",
-                           "title": "Database Management Systems eBooks For All Edition"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Delphi / Pascal",
-                     "entries": [
-                        {
-                           "url": "http://www.marcocantu.com/epascal/",
-                           "title": "Essential Pascal Version 1 and 2"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/expert-delphi",
-                           "title": "Expert Delphi"
-                        },
-                        {
-                           "url": "https://github.com/michaliskambi/modern-pascal-introduction",
-                           "title": "Modern Object Pascal Introduction for Programmers"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "DTrace",
-                     "entries": [
-                        {
-                           "url": "http://dtrace.org/guide/preface.html",
-                           "title": "IllumOS Dynamic Tracing Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Eiffel",
-                     "entries": [
-                        {
-                           "url": "http://homepages.mcs.vuw.ac.nz/~tk/fps/fps-sans-escher.pdf",
-                           "title": "A Functional Pattern System for Object-Oriented Design"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Elixir",
-                     "entries": [
-                        {
-                           "url": "https://github.com/seven1m/30-days-of-elixir",
-                           "title": "30 Days of Elixir"
-                        },
-                        {
-                           "url": "https://elixirschool.com",
-                           "title": "Elixir School"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/elixir-succinctly",
-                           "title": "Elixir Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://elixir-lang.org/getting-started/introduction.html",
-                           "title": "Getting Started Guide"
-                        },
-                        {
-                           "url": "https://joyofelixir.com",
-                           "title": "Joy of Elixir"
-                        },
-                        {
-                           "url": "http://learningelixir.joekain.com",
-                           "title": "Learning Elixir"
-                        },
-                        {
-                           "url": "http://www.binarywebpark.com/ultimate-guide-elixir-object-oriented-programmers",
-                           "title": "The Ultimate Guide To Elixir For Object-Oriented Programmers"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Ecto",
-                           "entries": [
-                              {
-                                 "url": "https://hexdocs.pm/ecto/getting-started.html#content",
-                                 "title": "Ecto Getting Started Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Phoenix",
-                           "entries": [
-                              {
-                                 "url": "https://hexdocs.pm/phoenix/overview.html",
-                                 "title": "Phoenix Framework Guide"
-                              },
-                              {
-                                 "url": "https://elviovicosa.com/freebies/versioned-apis-with-phoenix-by-elvio-vicosa.pdf",
-                                 "title": "Versioned APIs with Phoenix"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Emacs",
-                     "entries": [
-                        {
-                           "url": "https://www.gnu.org/software/emacs/manual/html_node/eintr/index.html",
-                           "title": "An Introduction to Programming in Emacs Lisp, 3rd Edition"
-                        },
-                        {
-                           "url": "https://www.finseth.com/craft/",
-                           "title": "Emacs for the Modern World"
-                        },
-                        {
-                           "url": "http://www.gnu.org/software/emacs/manual/elisp.html",
-                           "title": "GNU Emacs Lisp Reference Manual"
-                        },
-                        {
-                           "url": "https://www.gnu.org/software/emacs/manual/pdf/emacs.pdf",
-                           "title": "GNU Emacs Manual"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Embedded Systems",
-                     "entries": [
-                        {
-                           "url": "http://www.learn-c.com",
-                           "title": "Control and Embedded Systems"
-                        },
-                        {
-                           "url": "http://www.cs.indiana.edu/~geobrown/book.pdf",
-                           "title": "Discovering the STM32 Microcontroller"
-                        },
-                        {
-                           "url": "https://www.phaedsys.com/principals/bytecraft/bytecraftdata/bcfirststeps.pdf",
-                           "title": "First Steps with Embedded Systems"
-                        },
-                        {
-                           "url": "https://ptolemy.berkeley.edu/books/leeseshia/releases/LeeSeshia_DigitalV2_2.pdf",
-                           "title": "Introduction to Embedded Systems, Second Edition"
-                        },
-                        {
-                           "url": "http://www.embeddedrelated.com/showarticle/453.php",
-                           "title": "Introduction to Microcontrollers"
-                        },
-                        {
-                           "url": "https://freertos.org/Documentation/RTOS_book.html",
-                           "title": "Mastering the FreeRTOS Real Time Kernel - a Hands On Tutorial Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Erlang",
-                     "entries": [
-                        {
-                           "url": "http://beam-wisdoms.clau.se/en/latest/",
-                           "title": "BEAM Wisdoms"
-                        },
-                        {
-                           "url": "http://www.erlang.org/download/erlang-book-part1.pdf",
-                           "title": "Concurrent Programming in ERLANG"
-                        },
-                        {
-                           "url": "https://github.com/esl/erlang-handbook/raw/master/output/ErlangHandbook.pdf",
-                           "title": "Erlang Handbook"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Erlang_Programming",
-                           "title": "Erlang Programming"
-                        },
-                        {
-                           "url": "http://www.erlang.org/doc/getting_started/users_guide.html",
-                           "title": "Getting Started with Erlang User's Guide"
-                        },
-                        {
-                           "url": "http://learnyousomeerlang.com",
-                           "title": "Learn You Some Erlang For Great Good"
-                        },
-                        {
-                           "url": "http://www.erlang.org/download/armstrong_thesis_2003.pdf",
-                           "title": "Making reliable distributed systems in the presence of software errors"
-                        },
-                        {
-                           "url": "https://www.erlang-in-anger.com",
-                           "title": "Stuff Goes Bad: Erlang in Anger"
-                        },
-                        {
-                           "url": "https://blog.stenmans.org/theBeamBook",
-                           "title": "The BEAM Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "ESP8266",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/ESP8266_ESP32",
-                           "title": "Kolban's book on the ESP32 & ESP8266"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "F Sharp",
-                     "entries": [
-                        {
-                           "url": "https://www.oreilly.com/programming/free/files/analyzing-visualizing-data-f-sharp.pdf",
-                           "title": "Analyzing and Visualizing Data with F#"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/swlaschin/fsharpforfunandprofit/details",
-                           "title": "F# for fun and profit"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/F_Sharp_Programming",
-                           "title": "F# Programming"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/fsharp",
-                           "title": "F# Succinctly, SyncFusion"
-                        },
-                        {
-                           "url": "https://www.overleaf.com/read/hcwwdfxvftfp",
-                           "title": "Functional Programming Textbook"
-                        },
-                        {
-                           "url": "https://archive.org/details/B-001-003-622",
-                           "title": "Programming Language Concepts for Software Developers"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Firefox OS",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/quickguidefirefoxosdevelopment/read",
-                           "title": "Quick Guide For Firefox OS App Development: Creating HTML5 based apps for Firefox OS"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Flutter",
-                     "entries": [
-                        {
-                           "url": "https://flutter.dev/docs/cookbook",
-                           "title": "Cookbook"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/flutter-succinctly",
-                           "title": "Flutter Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "https://www.tutorialspoint.com/flutter",
-                           "title": "Flutter Tutorial"
-                        },
-                        {
-                           "url": "https://kodestat.gitbook.io/flutter",
-                           "title": "Flutter Tutorials Handbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Force.com",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20170102233924/https://resources.docs.salesforce.com/sfdc/pdf/apex_workbook.pdf",
-                           "title": "Apex Workbook"
-                        },
-                        {
-                           "url": "http://developer.force.com/workbook",
-                           "title": "Developer Workbooks"
-                        },
-                        {
-                           "url": "http://developerforce.s3.amazonaws.com/books/Force.com_Fundamentals.pdf",
-                           "title": "Force.com Fundamentals"
-                        },
-                        {
-                           "url": "http://www.lulu.com/shop/salesforcecom/forcecom-platform-fundamentals/ebook/product-17381451.html",
-                           "title": "Force.com Platform Fundamentals: An Introduction to Custom Application Development in the Cloud"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20160804055738/http://resources.docs.salesforce.com:80/sfdc/pdf/forcecom_workbook.pdf",
-                           "title": "Force.com Workbook"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20131209081736/http://media.developerforce.com/workbooks/HerokuPostgres_Workbooks_Web_Final.pdf",
-                           "title": "Heroku Postgres"
-                        },
-                        {
-                           "url": "https://res.cloudinary.com/hy4kyit2a/image/upload/workbook_text_Heroku.pdf",
-                           "title": "Heroku Workbook"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20150919023850/https://resources.docs.salesforce.com/sfdc/pdf/integration_workbook.pdf",
-                           "title": "Integration Workbook"
-                        },
-                        {
-                           "url": "https://res.cloudinary.com/hy4kyit2a/image/upload/s1_mobile_woorkbook_v3-21.pdf",
-                           "title": "Salesforce1 Mobile App Workbook"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20150921195528/https://resources.docs.salesforce.com/sfdc/pdf/workbook_vf.pdf",
-                           "title": "Visualforce Workbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Forth",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20180919061255/http://galileo.phys.virginia.edu/classes/551.jvn.fall01/primer.htm",
-                           "title": "A Beginner's Guide to Forth"
-                        },
-                        {
-                           "url": "http://ficl.sourceforge.net/pdf/Forth_Primer.pdf",
-                           "title": "And so Forth..."
-                        },
-                        {
-                           "url": "http://www.mpeforth.com/arena/ProgramForth.pdf",
-                           "title": "Programming Forth"
-                        },
-                        {
-                           "url": "http://home.iae.nl/users/mhx/sf.html",
-                           "title": "Starting Forth"
-                        },
-                        {
-                           "url": "http://thinking-forth.sourceforge.net",
-                           "title": "Thinking Forth"
-                        },
-                        {
-                           "url": "http://www.ultratechnology.com/forth.htm",
-                           "title": "Thoughtful Programming and Forth"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Fortran",
-                     "entries": [
-                        {
-                           "url": "http://www.cs.mtu.edu/~shene/COURSES/cs201/NOTES/fortran.html",
-                           "title": "Fortran 90 Tutorial"
-                        },
-                        {
-                           "url": "https://web.stanford.edu/class/me200c/tutorial_90/",
-                           "title": "Fortran 90 Tutorial"
-                        },
-                        {
-                           "url": "https://www.fortranplus.co.uk/fortran-information/",
-                           "title": "Fortran information & resources"
-                        },
-                        {
-                           "url": "https://www.ibiblio.org/pub/languages/fortran/unct.html",
-                           "title": "FORTRAN Performance Tuning co-Guide (1998)"
-                        },
-                        {
-                           "url": "https://qc2-teaching.readthedocs.io/en/latest/programming.html",
-                           "title": "Introduction to Fortran"
-                        },
-                        {
-                           "url": "https://modern-fortran-in-science-and-technology.readthedocs.io/en/latest",
-                           "title": "Modern Fortran in Science and Technology"
-                        },
-                        {
-                           "url": "https://masuday.github.io/fortran_tutorial/",
-                           "title": "Modern Fortran Tutorial"
-                        },
-                        {
-                           "url": "https://www.star.le.ac.uk/~cgp/prof77.pdf",
-                           "title": "Professional Programmer’s Guide to Fortran77 (2005)"
-                        },
-                        {
-                           "url": "http://www.mrao.cam.ac.uk/~rachael/compphys/SelfStudyF95.pdf",
-                           "title": "Self Study Guide 2: Programming in Fortran 95"
-                        },
-                        {
-                           "url": "https://www.ibiblio.org/pub/languages/fortran/",
-                           "title": "User Notes On Fortran Programming (UNFP): An open cooperative practical guide (1998)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "FreeBSD",
-                     "entries": [
-                        {
-                           "url": "http://www.freebsd.org/docs/books.html",
-                           "title": "Books and Articles from FreeBSD Site"
-                        },
-                        {
-                           "url": "http://www.lemis.com/grog/Documentation/CFBSD/",
-                           "title": "The Complete FreeBSD"
-                        },
-                        {
-                           "url": "http://www.bitsinthewind.com/about-dac/publications/using-c-on-the-unix-system",
-                           "title": "Using C on the UNIX System"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Git",
-                     "entries": [
-                        {
-                           "url": "http://marklodato.github.io/visual-git-guide/index-en.html",
-                           "title": "A Visual Git Reference"
-                        },
-                        {
-                           "url": "http://blog.anvard.org/conversational-git/",
-                           "title": "Conversational Git"
-                        },
-                        {
-                           "url": "http://rogerdudler.github.io/git-guide/",
-                           "title": "git - the simple guide"
-                        },
-                        {
-                           "url": "http://eagain.net/articles/git-for-computer-scientists/",
-                           "title": "Git for Computer Scientists"
-                        },
-                        {
-                           "url": "https://jwiegley.github.io/git-from-the-bottom-up/",
-                           "title": "Git From The Bottom Up"
-                        },
-                        {
-                           "url": "http://gitimmersion.com",
-                           "title": "Git Immersion"
-                        },
-                        {
-                           "url": "http://cbx33.github.io/gitt/index.html",
-                           "title": "Git In The Trenches"
-                        },
-                        {
-                           "url": "https://github.com/pluralsight/git-internals-pdf/raw/master/drafts/peepcode-git.pdf",
-                           "title": "Git internals"
-                        },
-                        {
-                           "url": "http://www-cs-students.stanford.edu/~blynn/gitmagic/",
-                           "title": "Git Magic"
-                        },
-                        {
-                           "url": "http://goalkicker.com/GitBook",
-                           "title": "Git Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/library/view/git-pocket-guide/9781449327507",
-                           "title": "Git Pocket Guide"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20170602211147/http://gitref.org/",
-                           "title": "Git Reference"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/git",
-                           "title": "Git Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://documentup.com/skwp/git-workflows-book",
-                           "title": "Git Workflows"
-                        },
-                        {
-                           "url": "https://happygitwithr.com",
-                           "title": "Happy Git and GitHub for the useR"
-                        },
-                        {
-                           "url": "https://github.com/eonist/How-to-collaborate-on-github",
-                           "title": "How to Collaborate on Github"
-                        },
-                        {
-                           "url": "https://launchschool.com/books/git",
-                           "title": "Intoduction to Git and Github"
-                        },
-                        {
-                           "url": "http://cse.unl.edu/~cbourke/gitTutorial.pdf",
-                           "title": "Intoduction to Git and Github - Tutorial"
-                        },
-                        {
-                           "url": "https://github.com/bobbyiliev/introduction-to-git-and-github-ebook",
-                           "title": "Introduction to Git and GitHub eBook"
-                        },
-                        {
-                           "url": "http://www.git-tower.com/learn/git/ebook/command-line/introduction",
-                           "title": "Learn Git - Learn Version Control with Git"
-                        },
-                        {
-                           "url": "http://git-scm.com/book/en/v2",
-                           "title": "Pro Git"
-                        },
-                        {
-                           "url": "https://leanpub.com/progitreedited/read",
-                           "title": "Pro Git Reedited"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20161121145226/http://rypress.com:80/tutorials/git/index",
-                           "title": "Ry's Git Tutorial"
-                        },
-                        {
-                           "url": "http://think-like-a-git.net",
-                           "title": "Think Like (a) Git: A Guide for the Perplexed"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Go",
-                     "entries": [
-                        {
-                           "url": "http://www.golang-book.com",
-                           "title": "An Introduction to Programming in Go"
-                        },
-                        {
-                           "url": "https://astaxie.gitbooks.io/build-web-application-with-golang/content/en/",
-                           "title": "Build Web Application with Golang"
-                        },
-                        {
-                           "url": "https://codegangsta.gitbooks.io/building-web-apps-with-go/content/",
-                           "title": "Building Web Apps with Go"
-                        },
-                        {
-                           "url": "https://rytisbiel.com/2021/03/06/darker-corners-of-go/",
-                           "title": "Darker Corners of Go"
-                        },
-                        {
-                           "url": "https://golang.org/doc/effective_go.html",
-                           "title": "Effective Go"
-                        },
-                        {
-                           "url": "https://go101.org/article/101.html",
-                           "title": "Go 101"
-                        },
-                        {
-                           "url": "http://www.golangbootcamp.com/book",
-                           "title": "Go Bootcamp"
-                        },
-                        {
-                           "url": "https://gobyexample.com",
-                           "title": "Go by Example"
-                        },
-                        {
-                           "url": "https://github.com/bulim/go-for-javascript-developers",
-                           "title": "Go for Javascript Developers"
-                        },
-                        {
-                           "url": "https://www.digitalocean.com/community/books/how-to-code-in-go-ebook",
-                           "title": "How To Code in Go"
-                        },
-                        {
-                           "url": "https://quii.gitbook.io/learn-go-with-tests/",
-                           "title": "Learn Go with Tests"
-                        },
-                        {
-                           "url": "https://miek.nl/go/",
-                           "title": "Learning Go"
-                        },
-                        {
-                           "url": "http://go-book.readthedocs.io/en/latest/",
-                           "title": "Let's learn Go!"
-                        },
-                        {
-                           "url": "https://leanpub.com/gocrypto/read",
-                           "title": "Practical Cryptography With Go"
-                        },
-                        {
-                           "url": "http://tour.golang.org",
-                           "title": "The Go Tutorial"
-                        },
-                        {
-                           "url": "https://github.com/karlseguin/the-little-go-book",
-                           "title": "The Little Go Book"
-                        },
-                        {
-                           "url": "https://github.com/thewhitetulip/web-dev-golang-anti-textbook/",
-                           "title": "Web apps in Go, the anti textbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Groovy",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "Gradle",
-                           "entries": [
-                              {
-                                 "url": "http://spring.io/guides/gs/gradle/",
-                                 "title": "Building Java Projects with Gradle"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/gradle_succinctly",
-                                 "title": "Gradle Succinctly"
-                              },
-                              {
-                                 "url": "https://docs.gradle.org/current/userguide/userguide.html",
-                                 "title": "Gradle User Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Grails",
-                           "entries": [
-                              {
-                                 "url": "http://www.infoq.com/minibooks/grails-getting-started",
-                                 "title": "Getting Started with Grails"
-                              },
-                              {
-                                 "url": "http://grails.asia/grails-tutorial-for-beginners/",
-                                 "title": "Grails Tutorial for Beginners"
-                              },
-                              {
-                                 "url": "http://grails.github.io/grails-doc/latest/",
-                                 "title": "The Grails Framework - Reference Documentation"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spock Framework",
-                           "entries": [
-                              {
-                                 "url": "https://spockframework.github.io/spock/docs/current/index.html",
-                                 "title": "Spock Framework Reference Documentation"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Hack",
-                     "entries": [
-                        {
-                           "url": "https://docs.hhvm.com/hack/",
-                           "title": "Hack Documentation"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Hadoop",
-                     "entries": [
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/big-data-analytics-hadoop-3",
-                           "title": "Big Data Analytics with Hadoop 3"
-                        },
-                        {
-                           "url": "https://docs.cloudera.com/documentation/enterprise/latest/PDF/cloudera-impala.pdf",
-                           "title": "Cloudera Impala"
-                        },
-                        {
-                           "url": "http://lintool.github.io/MapReduceAlgorithms/MapReduce-book-final.pdf",
-                           "title": "Data-Intensive Text Processing with MapReduce"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/hadoop-for-windows-succinctly",
-                           "title": "Hadoop for Windows Succinctly"
-                        },
-                        {
-                           "url": "http://hadoopilluminated.com/index.html",
-                           "title": "Hadoop Illuminated"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haskell",
-                     "entries": [
-                        {
-                           "url": "https://www.haskell.org/tutorial/",
-                           "title": "A Gentle Introduction to Haskell"
-                        },
-                        {
-                           "url": "http://www.cs.utexas.edu/~wcook/anatomy/",
-                           "title": "Anatomy of Programming Languages"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20160411023943/http://www.renci.org/wp-content/pub/tutorials/BeautifulCode.pdf",
-                           "title": "Beautiful Code, Compelling Evidence"
-                        },
-                        {
-                           "url": "http://www.andres-loeh.de/ExploringGH.pdf",
-                           "title": "Exploring Generic Haskell"
-                        },
-                        {
-                           "url": "http://www.happylearnhaskelltutorial.com",
-                           "title": "Happy Learn Haskell Tutorial"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Haskell",
-                           "title": "Haskell"
-                        },
-                        {
-                           "url": "http://www.yesodweb.com/book-1.4",
-                           "title": "Haskell and Yesod"
-                        },
-                        {
-                           "url": "http://lisperati.com/haskell/",
-                           "title": "Haskell no panic"
-                        },
-                        {
-                           "url": "https://goalkicker.com/HaskellBook/",
-                           "title": "Haskell Notes for Professionals"
-                        },
-                        {
-                           "url": "http://yannesposito.com/Scratch/fr/blog/Yesod-tutorial-for-newbies/",
-                           "title": "Haskell web Programming"
-                        },
-                        {
-                           "url": "http://yannesposito.com/Scratch/en/blog/Haskell-the-Hard-Way/",
-                           "title": "Learn Haskell Fast and Hard"
-                        },
-                        {
-                           "url": "http://learnyouahaskell.com",
-                           "title": "Learn You a Haskell for Great Good"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/library/view/parallel-and-concurrent/9781449335939/",
-                           "title": "Parallel and Concurrent Programming in Haskell"
-                        },
-                        {
-                           "url": "http://book.realworldhaskell.org",
-                           "title": "Real World Haskell"
-                        },
-                        {
-                           "url": "http://www.sthaskell.com",
-                           "title": "Speeding Through Haskell"
-                        },
-                        {
-                           "url": "http://dev.stephendiehl.com/hask/",
-                           "title": "What I Wish I Knew When Learning Haskell"
-                        },
-                        {
-                           "url": "https://github.com/anchpop/wise_mans_haskell/blob/master/book.md#preface",
-                           "title": "Wise Man's Haskell"
-                        },
-                        {
-                           "url": "http://hal3.name/docs/daume02yaht.pdf",
-                           "title": "Yet Another Haskell Tutorial"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Haxe",
-                     "entries": [
-                        {
-                           "url": "https://github.com/markknol/flambe-guide/wiki",
-                           "title": "Flambe Handbook"
-                        },
-                        {
-                           "url": "https://matthijskamstra.github.io/haxejs/",
-                           "title": "Haxe and JavaScript"
-                        },
-                        {
-                           "url": "http://haxe.org/documentation/introduction/",
-                           "title": "Haxe Manual"
-                        },
-                        {
-                           "url": "http://haxeflixel.com/documentation/haxeflixel-handbook/",
-                           "title": "HaxeFlixel Handbook"
-                        },
-                        {
-                           "url": "https://github.com/KTXSoftware/Kha/wiki/Tutorials",
-                           "title": "Kha Handbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "HTML / CSS",
-                     "entries": [
-                        {
-                           "url": "http://learn.shayhowe.com/html-css/",
-                           "title": "A beginner's guide to HTML&CSS"
-                        },
-                        {
-                           "url": "http://marksheet.io",
-                           "title": "A free guide to learn HTML and CSS"
-                        },
-                        {
-                           "url": "http://adaptivewebdesign.info/1st-edition/",
-                           "title": "Adaptive Web Design"
-                        },
-                        {
-                           "url": "http://learn.shayhowe.com/advanced-html-css/",
-                           "title": "An advanced guide to HTML&CSS"
-                        },
-                        {
-                           "url": "https://atomicdesign.bradfrost.com",
-                           "title": "Atomic Design"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20160505010319/http://learnjs.io/canvassing/read/",
-                           "title": "Canvassing"
-                        },
-                        {
-                           "url": "http://mdo.github.io/code-guide/",
-                           "title": "Code Guide: Standards for developing flexible, durable, and sustainable HTML and CSS"
-                        },
-                        {
-                           "url": "https://github.com/cssanimation/css-animation-101",
-                           "title": "CSS Animation 101"
-                        },
-                        {
-                           "url": "http://goalkicker.com/CSSBook",
-                           "title": "CSS Notes for Professionals"
-                        },
-                        {
-                           "url": "http://diveinto.html5doctor.com",
-                           "title": "Dive Into HTML5"
-                        },
-                        {
-                           "url": "http://domenlightenment.com",
-                           "title": "DOM Enlightenment"
-                        },
-                        {
-                           "url": "https://dash.generalassemb.ly",
-                           "title": "GA Dash"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/htmlcssguide.html",
-                           "title": "Google's HTML/CSS Style Guide"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180816174417/http://howtocodeinhtml.com/HowToCodeInHTML5AndCSS3.pdf",
-                           "title": "How to Code in HTML5 and CSS3"
-                        },
-                        {
-                           "url": "http://joshondesign.com/p/books/canvasdeepdive/toc.html",
-                           "title": "HTML Canvas Deep Dive"
-                        },
-                        {
-                           "url": "http://www.htmldog.com",
-                           "title": "HTML Dog Tutorials"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/library/view/html5-canvas/9781449308032/ch01.html",
-                           "title": "HTML5 Canvas"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/library/view/html5-for-publishers/9781449320065/pr02.html",
-                           "title": "HTML5 for Publishers"
-                        },
-                        {
-                           "url": "http://html5forwebdesigners.com",
-                           "title": "HTML5 For Web Designers"
-                        },
-                        {
-                           "url": "http://goalkicker.com/HTML5Book/",
-                           "title": "HTML5 Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.ossblog.org/wp-content/uploads/2017/06/html5-quick-learning-quide.pdf",
-                           "title": "HTML5 Quick Learning Guide"
-                        },
-                        {
-                           "url": "https://leanpub.com/html5shootemupinanafternoon/read",
-                           "title": "HTML5 Shoot 'em Up in an Afternoon"
-                        },
-                        {
-                           "url": "https://www.internetingishard.com",
-                           "title": "Interneting is Hard (But it Doesn't Have to Be)"
-                        },
-                        {
-                           "url": "http://learnlayout.com",
-                           "title": "Learn CSS Layout"
-                        },
-                        {
-                           "url": "http://book.mixu.net/css/",
-                           "title": "Learn CSS Layout the pedantic way"
-                        },
-                        {
-                           "url": "https://learn.shayhowe.com",
-                           "title": "Learn to Code HTML & CSS"
-                        },
-                        {
-                           "url": "https://adamschwartz.co/magic-of-css/",
-                           "title": "Magic of CSS"
-                        },
-                        {
-                           "url": "http://maintainablecss.com",
-                           "title": "MaintainableCSS"
-                        },
-                        {
-                           "url": "https://svgpocketguide.com",
-                           "title": "Pocket Guide to Writing SVG"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20181215200026/http://apress.jensimmons.com/v5/pro-html5-programming/ch0.html",
-                           "title": "Pro HTML5 Programming"
-                        },
-                        {
-                           "url": "https://resilientwebdesign.com/#Resilientweb%20design",
-                           "title": "Resilient Web Design"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20191116073929/http://smacss.com/",
-                           "title": "Scalable and Modular Architecture for CSS"
-                        },
-                        {
-                           "url": "https://ohansemmanuel.github.io/uf_download.html",
-                           "title": "Understanding Flexbox: Everything you need to know"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/w3_css_succinctly",
-                           "title": "W3.CSS Succinctly"
-                        },
-                        {
-                           "url": "http://chimera.labs.oreilly.com/books/1234000001552",
-                           "title": "Web Audio API"
-                        },
-                        {
-                           "url": "https://leanpub.com/web-visual-effects-with-css3/read",
-                           "title": "Web Visual Effects with CSS3"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Bootstrap",
-                           "entries": [
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/details/ebooks/twitterbootstrap3",
-                                 "title": "Twitter Bootstrap 3 Succinctly"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/twitterbootstrap4-succinctly",
-                                 "title": "Twitter Bootstrap 4 Succinctly"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/details/ebooks/twitterbootstrap",
-                                 "title": "Twitter Bootstrap Succinctly"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Idris",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/gidti",
-                           "title": "Gentle Introduction to Dependent Types with Idris"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Icon",
-                     "entries": [
-                        {
-                           "url": "http://www.cs.arizona.edu/icon/ibsale.htm",
-                           "title": "The Implementation of the Icon Programming Language"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "iOS",
-                     "entries": [
-                        {
-                           "url": "http://cocoadevcentral.com",
-                           "title": "Cocoa Dev Central"
-                        },
-                        {
-                           "url": "http://www.techotopia.com/index.php/IOS_8_App_Development_Essentials",
-                           "title": "iOS 8 App Development Essentials"
-                        },
-                        {
-                           "url": "https://goalkicker.com/iOSBook/",
-                           "title": "iOS Developer Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/ios",
-                           "title": "iOS Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://nshipster.com/#archive",
-                           "title": "NSHipster"
-                        },
-                        {
-                           "url": "https://developer.apple.com/library/prerelease/ios/referencelibrary/GettingStarted/DevelopiOSAppsSwift/index.html",
-                           "title": "Start Developing iOS Apps (Swift)"
-                        },
-                        {
-                           "url": "http://everythingcomputerscience.com/books/RoadMapiOS.pdf",
-                           "title": "Start Developing iOS Apps Today (Objective-C) - Last updated 22.10.2013"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "IoT",
-                     "entries": [
-                        {
-                           "url": "https://github.com/marcozennaro/IPv6-WSN-book/tree/master/Releases",
-                           "title": "IoT in five days- V1.1"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/mastering-internet-things",
-                           "title": "Mastering Internet of Things"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Isabelle/HOL",
-                     "entries": [
-                        {
-                           "url": "http://www21.in.tum.de/~nipkow/Concrete-Semantics/",
-                           "title": "Concrete Semantics - A Proof Assistant Approach by Tobias Nipkow and Gerwin Klein"
-                        },
-                        {
-                           "url": "http://isabelle.in.tum.de/doc/tutorial.pdf",
-                           "title": "Isabelle/HOL - A Proof Assistant for Higher-Order Logic by Tobias Nipkow and Lawrence C. Paulson and Markus Wenzel"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "J",
-                     "entries": [
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/arithmetic.pdf",
-                           "title": "Arithmetic by Kenneth E Iverson"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/brief.pdf",
-                           "title": "Brief Reference by Chris Burke and Clifford Reiter"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/calculus.pdf",
-                           "title": "Calculus by Kenneth E Iverson"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/papers/camn.htm",
-                           "title": "Computers and Mathematical Notation by Kenneth E Iverson"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/cmc.pdf",
-                           "title": "Concrete Math Companion by Kenneth E Iverson"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/easyj.pdf",
-                           "title": "Easy J by Linda Alvord, Norman Thomson"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/expmath.pdf",
-                           "title": "Exploring Math by Kenneth E Iverson"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/help/jforc/contents.htm",
-                           "title": "J for C Programmers by Henry Rich"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/help/primer/contents.htm",
-                           "title": "J Primer"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/help/learning/contents.htm",
-                           "title": "Learning J by Roger Stokes- online"
-                        },
-                        {
-                           "url": "http://www.jsoftware.com/books/pdf/mftl.zip",
-                           "title": "Math for the Layman by Kenneth E Iverson"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Java",
-                     "entries": [
-                        {
-                           "url": "http://www.mat.uniroma2.it/~picard/SMC/didattica/materiali_did/Java/Java_3D/Java_3D_Programming.pdf",
-                           "title": "3D Programming in Java"
-                        },
-                        {
-                           "url": "http://ptgmedia.pearsoncmg.com/images/0131478303/downloads/Iverson_book.pdf",
-                           "title": "Apache Jakarta Commons: Reusable Java Components"
-                        },
-                        {
-                           "url": "https://artint.info/2e/html/ArtInt2e.html",
-                           "title": "Artificial Intelligence - Foundations of Computational Agents, Second Edition"
-                        },
-                        {
-                           "url": "https://web-engineering.info/tech/JavaJpaJsf/book/",
-                           "title": "Building Back-End Web Apps with Java, JPA and JSF"
-                        },
-                        {
-                           "url": "https://www.mkyong.com/all-tutorials-on-mkyong-com/",
-                           "title": "Category wise tutorials - J2EE"
-                        },
-                        {
-                           "url": "http://pdf.coreservlets.com",
-                           "title": "Core Servlets and JavaServer Pages, 2nd Ed. (2003)"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20190302130416/http://dept.cs.williams.edu/~bailey/JavaStructures/Book_files/JavaStructures.pdf",
-                           "title": "Data Structures in Java for the Principled Programmer (2007)"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/javaguide.html",
-                           "title": "Google's Java Style Guide"
-                        },
-                        {
-                           "url": "https://introcs.cs.princeton.edu/java/cs/",
-                           "title": "Introduction to Computer Science \"booksite\""
-                        },
-                        {
-                           "url": "http://www.programmedlessons.org/Java9/index.html",
-                           "title": "Introduction to Computer science using Java"
-                        },
-                        {
-                           "url": "http://introcs.cs.princeton.edu/java/home/",
-                           "title": "Introduction to Programming in Java"
-                        },
-                        {
-                           "url": "http://math.hws.edu/javanotes",
-                           "title": "Introduction to Programming Using Java"
-                        },
-                        {
-                           "url": "https://math.hws.edu/eck/cs124/javanotes5",
-                           "title": "Introduction to Programming Using Java (5th Edition - final version, 2010 Jun)"
-                        },
-                        {
-                           "url": "https://ptgmedia.pearsoncmg.com/images/013143697X/downloads/013143697X_book.pdf",
-                           "title": "Java Application Development on Linux (2005)"
-                        },
-                        {
-                           "url": "https://archive.org/details/JavaJavaJavaObject-orientedProblemSolving/page/n0",
-                           "title": "Java, Java, Java Object-Oriented Problem Solving"
-                        },
-                        {
-                           "url": "https://docs.oracle.com/javase/specs/",
-                           "title": "Java Language and Virtual Machine Specifications"
-                        },
-                        {
-                           "url": "http://goalkicker.com/JavaBook/",
-                           "title": "Java Notes for Professionals"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Java_Programming",
-                           "title": "Java Programming"
-                        },
-                        {
-                           "url": "https://yfain.github.io/Java4Kids/",
-                           "title": "Java Programming for Kids"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/java-projects-second-edition",
-                           "title": "Java Projects, Second Edition"
-                        },
-                        {
-                           "url": "https://www.redbooks.ibm.com/redbooks/pdfs/sg248357.pdf",
-                           "title": "Microservices Best Practices for Java"
-                        },
-                        {
-                           "url": "http://computing.southern.edu/halterman/OOPJ/",
-                           "title": "Object-Oriented Programming in JavaTM Textbook"
-                        },
-                        {
-                           "url": "https://bookboon.com/en/object-oriented-programming-using-java-ebook",
-                           "title": "Object Oriented Programming using Java"
-                        },
-                        {
-                           "url": "http://pub.bruckner.cz/titles/oop",
-                           "title": "OOP - Learn Object Oriented Thinking & Programming"
-                        },
-                        {
-                           "url": "http://opendatastructures.org/ods-java.pdf",
-                           "title": "Open Data Structures (in Java)"
-                        },
-                        {
-                           "url": "https://leanpub.com/playing-with-java-microservices-on-k8s-and-ocp",
-                           "title": "Playing with Java Microservices on Kubernetes and OpenShift"
-                        },
-                        {
-                           "url": "http://www.cafeconleche.org/books/xmljava/",
-                           "title": "Processing XML with Java (A Guide to SAX, DOM, JDOM, JAXP, and TrAX) (2002)"
-                        },
-                        {
-                           "url": "https://leanpub.com/itext_pdfabc",
-                           "title": "The ABC of PDF with iText: PDF Syntax essentials"
-                        },
-                        {
-                           "url": "https://docs.oracle.com/javaee/6/tutorial/doc/javaeetutorial6.pdf",
-                           "title": "The Java EE6 Tutorial"
-                        },
-                        {
-                           "url": "https://docs.oracle.com/javaee/7/JEETT.pdf",
-                           "title": "The Java EE7 Tutorial"
-                        },
-                        {
-                           "url": "https://docs.oracle.com/javase/tutorial/index.html",
-                           "title": "The Java Tutorials"
-                        },
-                        {
-                           "url": "https://www.scrapingbee.com/java-webscraping-book",
-                           "title": "The Java Web Scraping Handbook"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/think-data-structures/",
-                           "title": "Think Data Structures: Algorithms and Information Retrieval in Java"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/think-java-2e/",
-                           "title": "Think Java: How to Think Like a Computer Scientist, 2nd Edition"
-                        },
-                        {
-                           "url": "https://www.vogella.com/tutorials/RxJava/article.html",
-                           "title": "Using RxJava 2 Tutorial"
-                        },
-                        {
-                           "url": "https://runestone.academy/runestone/books/published/java4python/index.html",
-                           "title": "Welcome to Java for Python Programmers"
-                        },
-                        {
-                           "url": "http://javaworkshop.sourceforge.net",
-                           "title": "Welcome to the Java Workshop (2006)"
-                        },
-                        {
-                           "url": "https://leanpub.com/whatsnewinjava8/read",
-                           "title": "What’s New in Java 8"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Codename One",
-                           "entries": [
-                              {
-                                 "url": "https://www.codenameone.com/files/developer-guide.pdf",
-                                 "title": "Codename One Developer Guide"
-                              },
-                              {
-                                 "url": "http://uber.cn1.co",
-                                 "title": "Create an Uber Clone in 7 Days (first 2 chapters)"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "JasperReports",
-                           "entries": [
-                              {
-                                 "url": "http://jasperreports.sourceforge.net/JasperReports-Ultimate-Guide-3.pdf",
-                                 "title": "The JasperReports Ultimate Guide, Third Edition"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spring",
-                           "entries": [
-                              {
-                                 "url": "https://www.packtpub.com/free-ebooks/building-applications-spring-5-and-vuejs-2",
-                                 "title": "Building Applications with Spring 5 and Vue.js 2"
-                              },
-                              {
-                                 "url": "https://www.packtpub.com/free-ebooks/software-architecture-spring-50",
-                                 "title": "Software Architecture with Spring 5.0"
-                              },
-                              {
-                                 "url": "https://www.javacodegeeks.com/wp-content/uploads/2017/01/Spring-Framework-Cookbook.pdf",
-                                 "title": "Spring Framework Cookbook: Hot Recipes for Spring Framework"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/SpringFrameworkBook",
-                                 "title": "Spring Framework Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://docs.spring.io/spring/docs/current/spring-framework-reference/",
-                                 "title": "Spring Framework Reference Documentation"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spring Boot",
-                           "entries": [
-                              {
-                                 "url": "https://v.vaadin.com/hubfs/Pdfs/Building%20Modern%20Web%20Apps%20with%20Spring%20Boot%20and%20Vaadin.pdf",
-                                 "title": "Building modern Web Apps with Spring Boot and Vaadin"
-                              },
-                              {
-                                 "url": "https://docs.spring.io/spring-boot/docs/current/reference/html/",
-                                 "title": "Spring Boot Reference Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spring Data",
-                           "entries": [
-                              {
-                                 "url": "https://docs.spring.io/spring-data/jpa/docs/current/reference/html",
-                                 "title": "Spring Data Reference"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Spring Security",
-                           "entries": [
-                              {
-                                 "url": "http://docs.spring.io/spring-security/site/docs/current/reference/htmlsingle/",
-                                 "title": "Spring Security Reference"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Wicket",
-                           "entries": [
-                              {
-                                 "url": "http://wicket.apache.org/learn/#guide",
-                                 "title": "Official Free Online Guide for Apache Wicket framework"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "JavaScript",
-                     "entries": [
-                        {
-                           "url": "http://www.2ality.com/2013/06/basic-javascript.html",
-                           "title": "Basic JavaScript for the impatient programmer"
-                        },
-                        {
-                           "url": "https://github.com/tooling/book-of-modern-frontend-tooling",
-                           "title": "Book of Modern Frontend Tooling"
-                        },
-                        {
-                           "url": "https://web-engineering.info/JsFrontendApp-Book",
-                           "title": "Building Front-End Web Apps with Plain JavaScript"
-                        },
-                        {
-                           "url": "https://github.com/ryanmcdermott/clean-code-javascript",
-                           "title": "Clean Code JavaScript"
-                        },
-                        {
-                           "url": "http://www.crockford.com/javascript/",
-                           "title": "Crockford's JavaScript"
-                        },
-                        {
-                           "url": "https://exploringjs.com/deep-js",
-                           "title": "Deep JavaScript: Theory and techniques"
-                        },
-                        {
-                           "url": "https://www.manning.com/books/designing-scalable-javascript-applications",
-                           "title": "Designing Scalable JavaScript Applications"
-                        },
-                        {
-                           "url": "https://devdocs.io/javascript/",
-                           "title": "Dev Docs"
-                        },
-                        {
-                           "url": "http://eloquentjavascript.net",
-                           "title": "Eloquent JavaScript 3rd edition"
-                        },
-                        {
-                           "url": "http://exploringjs.com/es6/",
-                           "title": "Exploring ES6"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/javascriptguide.xml",
-                           "title": "Google JavaScript Style Guide"
-                        },
-                        {
-                           "url": "http://read.humanjavascript.com/ch01-introduction.html",
-                           "title": "Human JavaScript"
-                        },
-                        {
-                           "url": "https://leanpub.com/javascript-allonge/read",
-                           "title": "JavaScript Allongé"
-                        },
-                        {
-                           "url": "http://media.wiley.com/product_ancillary/28/07645334/DOWNLOAD/all.pdf",
-                           "title": "JavaScript Bible"
-                        },
-                        {
-                           "url": "https://tcorral.github.io/javascript-challenges-book/",
-                           "title": "JavaScript Challenges Book"
-                        },
-                        {
-                           "url": "http://www.javascriptenlightenment.com",
-                           "title": "JavaScript Enlightenment"
-                        },
-                        {
-                           "url": "https://github.com/AlbertoMontalesi/JavaScript-es6-and-beyond-ebook",
-                           "title": "JavaScript ES6 and beyond"
-                        },
-                        {
-                           "url": "http://jsforcats.com",
-                           "title": "JavaScript For Cats"
-                        },
-                        {
-                           "url": "https://exploringjs.com/impatient-js/toc.html",
-                           "title": "JavaScript for Impatient Programmers (ES2020 edition)"
-                        },
-                        {
-                           "url": "http://nicholasjohnson.com/javascript-book/",
-                           "title": "JavaScript Fundamentals, Plus a Dash Of JQuery - for dinner ladies"
-                        },
-                        {
-                           "url": "http://bonsaiden.github.io/JavaScript-Garden/",
-                           "title": "JavaScript Garden"
-                        },
-                        {
-                           "url": "https://gumroad.com/l/javascript-interview-35",
-                           "title": "JavaScript Interview #35"
-                        },
-                        {
-                           "url": "https://goalkicker.com/JavaScriptBook/",
-                           "title": "JavaScript Notes for Professionals"
-                        },
-                        {
-                           "url": "http://shichuan.github.io/javascript-patterns/",
-                           "title": "JavaScript Patterns Collection"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20160325064800/https://leanpub.com/javascript-spessore/read",
-                           "title": "JavaScript Spessore"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/javascript",
-                           "title": "JavaScript Succinctly"
-                        },
-                        {
-                           "url": "https://github.com/braziljs/js-the-right-way",
-                           "title": "JavaScript the Right Way"
-                        },
-                        {
-                           "url": "http://jqfundamentals.com",
-                           "title": "jQuery Fundamentals"
-                        },
-                        {
-                           "url": "http://markdaggett.com/images/ExpertJavaScript-ch6.pdf",
-                           "title": "JS Robots"
-                        },
-                        {
-                           "url": "https://leanpub.com/leaflet-tips-and-tricks/read",
-                           "title": "Leaflet Tips and Tricks: Interactive Maps Made Easy"
-                        },
-                        {
-                           "url": "http://addyosmani.com/resources/essentialjsdesignpatterns/book/",
-                           "title": "Learning JavaScript Design Patterns"
-                        },
-                        {
-                           "url": "https://bubblin.io/cover/let-s-learn-es6-by-ryan-christiani#frontmatter",
-                           "title": "Let's Learn ES6"
-                        },
-                        {
-                           "url": "http://www.noelrappin.com",
-                           "title": "Managing Space and Time with JavaScript - Book 1: The Basics"
-                        },
-                        {
-                           "url": "https://leanpub.com/marionetteexpose",
-                           "title": "Marionette Exposé: Learn to write modular Javascript applications using Backbone Marionette and RequireJS/AMD"
-                        },
-                        {
-                           "url": "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide",
-                           "title": "Mozilla Developer Network's JavaScript Guide"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/neural-networks-with-javascript-succinctly",
-                           "title": "Neural Networks with JavaScript Succinctly"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20150317231950/https://leanpub.com/ohmyjs/read",
-                           "title": "Oh My JS"
-                        },
-                        {
-                           "url": "http://addyosmani.com/largescalejavascript/",
-                           "title": "Patterns For Large-Scale JavaScript Application Architecture"
-                        },
-                        {
-                           "url": "https://github.com/mjavascript/practical-modern-javascript",
-                           "title": "Practical Modern JavaScript"
-                        },
-                        {
-                           "url": "https://mostly-adequate.gitbooks.io/mostly-adequate-guide/content/",
-                           "title": "Professor Frisby’s Mostly Adequate Guide to Functional Programming"
-                        },
-                        {
-                           "url": "https://molily.de/robust-javascript/",
-                           "title": "Robust Client-Side JavaScript"
-                        },
-                        {
-                           "url": "http://singlepageappbook.com",
-                           "title": "Single page apps in depth"
-                        },
-                        {
-                           "url": "http://speakingjs.com/es5/",
-                           "title": "Speaking JavaScript"
-                        },
-                        {
-                           "url": "https://www.ecma-international.org/publications/standards/Ecma-262.htm",
-                           "title": "Standard ECMA-262 ECMAScript 2016 Language Specification"
-                        },
-                        {
-                           "url": "http://javascript.info",
-                           "title": "The JavaScript Tutorial"
-                        },
-                        {
-                           "url": "https://github.com/bpesquet/thejsway",
-                           "title": "The JavaScript Way"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/programming/free/native-javascript-apis.csp",
-                           "title": "The Problem with Native JavaScript APIs"
-                        },
-                        {
-                           "url": "https://www.amazon.com/Thinking-JavaScript-Aravind-Shenoy-ebook/dp/B00JUI6LUQ",
-                           "title": "Thinking in JavaScript"
-                        },
-                        {
-                           "url": "https://leanpub.com/understandinges6/read",
-                           "title": "Understanding ECMAScript 6"
-                        },
-                        {
-                           "url": "http://robotlolita.me/2011/10/09/understanding-javascript-oop.html",
-                           "title": "Understanding JavaScript OOP"
-                        },
-                        {
-                           "url": "https://github.com/getify/You-Dont-Know-JS",
-                           "title": "You Don't Know JS"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "AngularJS",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/johnpapa/angular-styleguide/blob/master/a1/README.md",
-                                 "title": "Angular 1 Style Guide"
-                              },
-                              {
-                                 "url": "http://www.ng-newsletter.com.s3-website-us-east-1.amazonaws.com/posts/angular-for-the-jquery-developer.html",
-                                 "title": "Angular for the jQuery developer"
-                              },
-                              {
-                                 "url": "http://nicholasjohnson.com/angular-book/",
-                                 "title": "AngularJS - Step by Logical Step"
-                              },
-                              {
-                                 "url": "https://docs.angularjs.org/guide/",
-                                 "title": "AngularJS Guide"
-                              },
-                              {
-                                 "url": "https://material.angularjs.org/latest/",
-                                 "title": "AngularJS Material Designing"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/AngularJSBook",
-                                 "title": "AngularJS Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://github.com/toddmotto/angularjs-styleguide",
-                                 "title": "AngularJS Style Guide for teams"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/ebooks/angularjs",
-                                 "title": "AngularJS Succinctly"
-                              },
-                              {
-                                 "url": "https://docs.angularjs.org/tutorial",
-                                 "title": "AngularJS Tutorial"
-                              },
-                              {
-                                 "url": "https://angularjs-emberjs-compare.bguiz.com",
-                                 "title": "AngularJS vs EmberJs"
-                              },
-                              {
-                                 "url": "http://ngokevin.com/blog/angular-1/",
-                                 "title": "Seven-Part Introduction to AngularJS"
-                              },
-                              {
-                                 "url": "http://andyshora.com/unit-testing-best-practices-angularjs.html",
-                                 "title": "Unit Testing Best Practices in AngularJS"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Aurelia",
-                           "entries": [
-                              {
-                                 "url": "https://leanpub.com/beginning-of-aurelia",
-                                 "title": "Beginning Aurelia"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Backbone.js",
-                           "entries": [
-                              {
-                                 "url": "http://pragmatic-backbone.com",
-                                 "title": "A pragmatic guide to Backbone.js apps"
-                              },
-                              {
-                                 "url": "https://leanpub.com/backbonetutorials",
-                                 "title": "Backbone Tutorials: Beginner, Intermediate and Advanced"
-                              },
-                              {
-                                 "url": "https://cdnjs.com/libraries/backbone.js/tutorials/",
-                                 "title": "Backbonejs Tutorials"
-                              },
-                              {
-                                 "url": "https://singlepagebook.supportbee.com",
-                                 "title": "Building Single Page Web Apps with Backbone.js"
-                              },
-                              {
-                                 "url": "http://addyosmani.github.io/backbone-fundamentals/",
-                                 "title": "Developing Backbone.js Applications"
-                              },
-                              {
-                                 "url": "http://net.tutsplus.com/tutorials/javascript-ajax/getting-started-with-backbone-js/",
-                                 "title": "Getting Started with Backbone.js"
-                              },
-                              {
-                                 "url": "http://amirmalik.net/2010/11/27/how-to-share-backbonejs-models-with-nodejs",
-                                 "title": "How to share Backbone.js models with node.js"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Booty5.js",
-                           "entries": [
-                              {
-                                 "url": "http://booty5.com/booty5-free-html-game-maker-e-book-manual/",
-                                 "title": "The Booty5 HTML5 Game Maker Manual"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "D3.js",
-                           "entries": [
-                              {
-                                 "url": "https://leanpub.com/D3-Tips-and-Tricks/read",
-                                 "title": "D3 Tips and Tricks"
-                              },
-                              {
-                                 "url": "https://www.dashingd3js.com/d3-tutorial",
-                                 "title": "Dashing D3.js Tutorial"
-                              },
-                              {
-                                 "url": "http://alignedleft.com/tutorials/d3",
-                                 "title": "Interactive Data Visualization with D3"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Dojo",
-                           "entries": [
-                              {
-                                 "url": "https://www.oreilly.com/library/view/dojo-the-definitive/9780596516482/",
-                                 "title": "Dojo: The Definitive Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Elm",
-                           "entries": [
-                              {
-                                 "url": "https://guide.elm-lang.org",
-                                 "title": "An Introduction to Elm"
-                              },
-                              {
-                                 "url": "https://elmprogramming.com",
-                                 "title": "Beginning Elm"
-                              },
-                              {
-                                 "url": "http://tech.noredink.com/post/129641182738/building-a-live-validated-signup-form-in-elm",
-                                 "title": "Building a Live-Validating Signup Form in Elm"
-                              },
-                              {
-                                 "url": "https://accelerated.amimetic.co.uk",
-                                 "title": "Elm Accelerated"
-                              },
-                              {
-                                 "url": "https://en.wikibooks.org/wiki/Elm_programming_language",
-                                 "title": "Elm Programming Language"
-                              },
-                              {
-                                 "url": "https://legacy.gitbook.com/book/sporto/elm-tutorial/details",
-                                 "title": "Elm Tutorial"
-                              },
-                              {
-                                 "url": "https://learnyouanelm.github.io",
-                                 "title": "Learn You an Elm"
-                              },
-                              {
-                                 "url": "https://github.com/evancz/elm-architecture-tutorial",
-                                 "title": "The Elm Architecture"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Ember.js",
-                           "entries": [
-                              {
-                                 "url": "https://angularjs-emberjs-compare.bguiz.com",
-                                 "title": "AngularJs vs EmberJs"
-                              },
-                              {
-                                 "url": "https://github.com/DockYard/styleguides/blob/master/engineering/ember.md",
-                                 "title": "DockYard Ember.js Style Guide"
-                              },
-                              {
-                                 "url": "https://dockyard.com/blog/ember/2013/01/07/building-an-ember-app-with-rails-api-part-1",
-                                 "title": "Ember App with RailsApi"
-                              },
-                              {
-                                 "url": "https://guides.emberjs.com/release/",
-                                 "title": "Ember.js - Getting started"
-                              },
-                              {
-                                 "url": "http://ember.vicramon.com",
-                                 "title": "Vic Ramon's Ember Tutorial"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Express.js",
-                           "entries": [
-                              {
-                                 "url": "https://web.archive.org/web/20140621124403/https://leanpub.com/express/read",
-                                 "title": "Express.js Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Fastify",
-                           "entries": [
-                              {
-                                 "url": "https://www.fastify.io/docs/latest",
-                                 "title": "Fastify - Latest Documentation"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Ionic",
-                           "entries": [
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/ionic-4-succinctly",
-                                 "title": "Ionic 4 Succinctly"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "jQuery",
-                           "entries": [
-                              {
-                                 "url": "http://nicholasjohnson.com/javascript-book/",
-                                 "title": "JavaScript Fundamentals, Plus a Dash Of JQuery - for dinner ladies"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/jQueryBook/",
-                                 "title": "jQuery Notes for Professionals"
-                              },
-                              {
-                                 "url": "http://mediatheque.cite-musique.fr/MediaComposite/Debug/Dossier-Orchestre/ressources/jQuery.Novice.to.Ninja.2nd.Edition.pdf",
-                                 "title": "jQuery Novice to Ninja"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/ebooks/jquery",
-                                 "title": "jQuery Succinctly, Syncfusion"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Meteor",
-                           "entries": [
-                              {
-                                 "url": "http://meteortips.com/book/",
-                                 "title": "Your First Meteor Application, A Complete Beginner’s Guide to the Meteor JavaScript Framework"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Node.js",
-                           "entries": [
-                              {
-                                 "url": "https://nikhilm.github.io/uvbook/",
-                                 "title": "An Introduction to libuv"
-                              },
-                              {
-                                 "url": "https://github.com/azat-co/fullstack-javascript",
-                                 "title": "Full Stack JavaScript: Learn Backbone.js, Node.js and MongoDB"
-                              },
-                              {
-                                 "url": "https://nodejs.dev/learn",
-                                 "title": "Introduction to Node.js"
-                              },
-                              {
-                                 "url": "http://book.mixu.net/node/",
-                                 "title": "Mixu's Node Book"
-                              },
-                              {
-                                 "url": "https://nodejs.org/en/docs/",
-                                 "title": "Node Documentation"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/library/view/node-up-and/9781449332235/",
-                                 "title": "Node: Up and Running"
-                              },
-                              {
-                                 "url": "http://goalkicker.com/NodeJSBook",
-                                 "title": "Node.js Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/resources/techportal/ebooks/nodejs",
-                                 "title": "Node.js Succinctly, Syncfusion"
-                              },
-                              {
-                                 "url": "https://github.com/azat-co/practicalnode",
-                                 "title": "Practical Node.js: Building Real-World Scalable Web Apps"
-                              },
-                              {
-                                 "url": "http://nodebeginner.org",
-                                 "title": "The Node Beginner Book"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Om",
-                           "entries": [
-                              {
-                                 "url": "http://awkay.github.io/om-tutorial/",
-                                 "title": "Om Tutorial"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React",
-                           "entries": [
-                              {
-                                 "url": "https://www.packtpub.com/free-ebooks/full-stack-react-projects",
-                                 "title": "Full-Stack React Projects"
-                              },
-                              {
-                                 "url": "http://www.hackingwithreact.com",
-                                 "title": "Hacking with React"
-                              },
-                              {
-                                 "url": "http://code.tutsplus.com/tutorials/intro-to-the-react-framework--net-35660",
-                                 "title": "Intro to the React Framework"
-                              },
-                              {
-                                 "url": "https://scotch.io/tutorials/learning-react-getting-started-and-concepts",
-                                 "title": "Learning React.js: Getting Started and Concepts"
-                              },
-                              {
-                                 "url": "https://github.com/vasanthk/react-bits",
-                                 "title": "React-Bits"
-                              },
-                              {
-                                 "url": "https://github.com/softchris/react-book/",
-                                 "title": "React Book, your beginner guide to React"
-                              },
-                              {
-                                 "url": "https://www.reactenlightenment.com",
-                                 "title": "React Enlightenment"
-                              },
-                              {
-                                 "url": "https://developmentarc.gitbooks.io/react-indepth/content/",
-                                 "title": "React In-depth: An exploration of UI development"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/ReactJSBook/",
-                                 "title": "React JS Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://github.com/mikechau/react-primer-draft",
-                                 "title": "React Primer Draft"
-                              },
-                              {
-                                 "url": "https://www.syncfusion.com/ebooks/react-succinctly",
-                                 "title": "React Succinctly"
-                              },
-                              {
-                                 "url": "https://reactjs.org/tutorial/tutorial.html",
-                                 "title": "React Tutorial"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "React Native",
-                           "entries": [
-                              {
-                                 "url": "https://leanpub.com/programming-react-native",
-                                 "title": "Programming React Native"
-                              },
-                              {
-                                 "url": "http://browniefed.com/react-native-animation-book/",
-                                 "title": "React Native Animation Book"
-                              },
-                              {
-                                 "url": "http://www.reactnativeexpress.com",
-                                 "title": "React Native Express"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/ReactNativeBook",
-                                 "title": "React Native Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://www.gitbook.com/book/unbug/react-native-training/details",
-                                 "title": "React Native Training"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Redux",
-                           "entries": [
-                              {
-                                 "url": "http://teropa.info/blog/2015/09/10/full-stack-redux-tutorial.html",
-                                 "title": "Full-Stack Redux Tutorial"
-                              },
-                              {
-                                 "url": "https://www.robinwieruch.de/the-soundcloud-client-in-react-redux/",
-                                 "title": "SoundCloud Application in React + Redux"
-                              },
-                              {
-                                 "url": "https://leanpub.com/redux-book",
-                                 "title": "The Complete Redux Book"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Vue.js",
-                           "entries": [
-                              {
-                                 "url": "https://www.newline.co/30-days-of-vue",
-                                 "title": "30 Days Of Vue"
-                              },
-                              {
-                                 "url": "https://riptutorial.com/Download/vue-js.pdf",
-                                 "title": "Learning Vue.js"
-                              },
-                              {
-                                 "url": "https://flaviocopes.nyc3.digitaloceanspaces.com/vue-handbook/vue-handbook.pdf",
-                                 "title": "The Vue.js Handbook"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Jenkins",
-                     "entries": [
-                        {
-                           "url": "http://www.bogotobogo.com/DevOps/Jenkins/images/Intro_install/jenkins-the-definitive-guide.pdf",
-                           "title": "Jenkins: The Definitive Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Julia",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Introducing_Julia",
-                           "title": "Introducing Julia"
-                        },
-                        {
-                           "url": "http://samuelcolvin.github.io/JuliaByExample",
-                           "title": "Julia by Example"
-                        },
-                        {
-                           "url": "https://juliadatascience.io",
-                           "title": "Julia Data Science"
-                        },
-                        {
-                           "url": "https://syl1.gitbook.io/julia-language-a-concise-tutorial",
-                           "title": "Julia language: a concise tutorial"
-                        },
-                        {
-                           "url": "https://learnxinyminutes.com/docs/julia",
-                           "title": "Learn Julia in Y minutes"
-                        },
-                        {
-                           "url": "https://julia.quantecon.org/_downloads/pdf/quantitative_economics_with_julia.pdf",
-                           "title": "Quantitative Economics with Julia"
-                        },
-                        {
-                           "url": "http://bogumilkaminski.pl/files/julia_express.pdf",
-                           "title": "The Julia Express"
-                        },
-                        {
-                           "url": "https://benlauwens.github.io/ThinkJulia.jl/latest/book.html",
-                           "title": "Think Julia"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Kotlin",
-                     "entries": [
-                        {
-                           "url": "https://goalkicker.com/KotlinBook/",
-                           "title": "Kotlin Notes for Professionals"
-                        },
-                        {
-                           "url": "https://kotlinlang.org/docs/reference/",
-                           "title": "Kotlin Official Documentation"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "LaTeX / TeX",
-                     "entries": [],
-                     "subsections": [
-                        {
-                           "section": "LaTeX",
-                           "entries": [
-                              {
-                                 "url": "http://latex.knobs-dials.com",
-                                 "title": "Arbitrary LaTex Reference"
-                              },
-                              {
-                                 "url": "https://github.com/VoLuong/Begin-Latex-in-minutes",
-                                 "title": "Begin Latex in minutes"
-                              },
-                              {
-                                 "url": "https://en.wikibooks.org/wiki/LaTeX",
-                                 "title": "LaTeX"
-                              },
-                              {
-                                 "url": "https://tobi.oetiker.ch/lshort/lshort.pdf",
-                                 "title": "The Not So Short Introduction to LaTeX"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "TeX",
-                           "entries": [
-                              {
-                                 "url": "http://pgfplots.sourceforge.net/TeX-programming-notes.pdf",
-                                 "title": "Notes On Programming in TeX"
-                              },
-                              {
-                                 "url": "http://eijkhout.net/texbytopic/texbytopic.html",
-                                 "title": "TeX by Topic, A TeXnician's Reference"
-                              },
-                              {
-                                 "url": "https://www.gnu.org/software/teximpatient/",
-                                 "title": "TeX for the Impatient"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Limbo",
-                     "entries": [
-                        {
-                           "url": "http://doc.cat-v.org/inferno/books/inferno_programming_with_limbo/",
-                           "title": "Inferno Programming With Limbo"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Linux",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Ad_Hoc_Data_Analysis_From_The_Unix_Command_Line",
-                           "title": "Ad Hoc Data Analysis From The Unix Command Line"
-                        },
-                        {
-                           "url": "https://mentorembedded.github.io/advancedlinuxprogramming/",
-                           "title": "Advanced Linux Programming"
-                        },
-                        {
-                           "url": "http://www.linuxfromscratch.org/alfs/download.html",
-                           "title": "Automated Linux From Scratch"
-                        },
-                        {
-                           "url": "http://ubuntu-manual.org",
-                           "title": "Getting Started with Ubuntu"
-                        },
-                        {
-                           "url": "http://www.sourceware.org/autobook/download.html",
-                           "title": "GNU Autoconf, Automake and Libtool"
-                        },
-                        {
-                           "url": "http://www.linuxtopia.org/online_books/gui_toolkit_guides/gtk+_gnome_application_development/",
-                           "title": "GTK+/Gnome Application Development"
-                        },
-                        {
-                           "url": "http://www.linuxfromscratch.org/hlfs/download.html",
-                           "title": "Hardened Linux From Scratch"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/kali-linux-2018-assuring-security-penetration-testing-fourth-edition",
-                           "title": "Kali Linux 2018: Assuring Security by Penetration Testing, Fourth Edition"
-                        },
-                        {
-                           "url": "http://docs.kali.org",
-                           "title": "Kali Linux: Professional Penetration-Testing Distribution"
-                        },
-                        {
-                           "url": "http://www.oreilly.com/openbook/debian/book/index.html",
-                           "title": "Learning Debian GNU/Linux"
-                        },
-                        {
-                           "url": "http://thegeekstuff.s3.amazonaws.com/files/linux-101-hacks.zip",
-                           "title": "Linux 101 Hacks"
-                        },
-                        {
-                           "url": "http://www.linuxtopia.org/online_books/linux_administrators_security_guide/index.html",
-                           "title": "Linux Administrator's Security Guide"
-                        },
-                        {
-                           "url": "http://lartc.org",
-                           "title": "Linux Advanced Routing & Traffic Control HOWTO"
-                        },
-                        {
-                           "url": "http://librta.org/book.html",
-                           "title": "Linux Appliance Design: A Hands-On Guide to Building Linux Appliances"
-                        },
-                        {
-                           "url": "https://goalkicker.com/LinuxBook/",
-                           "title": "Linux commands Notes for Professionals"
-                        },
-                        {
-                           "url": "http://lwn.net/Kernel/LDD3/",
-                           "title": "Linux Device Drivers, Third Edition"
-                        },
-                        {
-                           "url": "http://www.linuxfromscratch.org/lfs/view/stable/",
-                           "title": "Linux from Scratch"
-                        },
-                        {
-                           "url": "http://linux-training.be/linuxfun.pdf",
-                           "title": "Linux Fundamentals"
-                        },
-                        {
-                           "url": "https://0xax.gitbooks.io/linux-insides/content/index.html",
-                           "title": "Linux Inside"
-                        },
-                        {
-                           "url": "http://www.kroah.com/lkn/",
-                           "title": "Linux Kernel in a Nutshell"
-                        },
-                        {
-                           "url": "http://lnag.sourceforge.net",
-                           "title": "Linux Newbie Administrator Guide"
-                        },
-                        {
-                           "url": "http://www.linuxtopia.org/LinuxSecurity/index.html",
-                           "title": "Linux Security for Beginners"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/linux",
-                           "title": "Linux Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://www.techotopia.com/index.php/Red_Hat_Enterprise_Linux_6_Essentials",
-                           "title": "Red Hat Enterprise Linux 6 Essentials"
-                        },
-                        {
-                           "url": "http://www.dwheeler.com/secure-programs/",
-                           "title": "Secure Programming HOWTO - Creating Secure Software"
-                        },
-                        {
-                           "url": "http://dullroar.com/book/TenStepsToLinuxSurvival.html",
-                           "title": "Ten Steps to Linux Survival: Bash for Windows People"
-                        },
-                        {
-                           "url": "https://debian-handbook.info",
-                           "title": "The Debian Administrator's Handbook"
-                        },
-                        {
-                           "url": "http://linuxcommand.org/tlcl.php",
-                           "title": "The Linux Command Line"
-                        },
-                        {
-                           "url": "http://ptgmedia.pearsoncmg.com/imprint_downloads/informit/perens/0130091154.pdf",
-                           "title": "The Linux Development Platform"
-                        },
-                        {
-                           "url": "https://sysprog21.github.io/lkmpg/",
-                           "title": "The Linux Kernel Module Programming Guide"
-                        },
-                        {
-                           "url": "http://www.tldp.org/LDP/sag/html/index.html",
-                           "title": "The Linux System Administrator's Guide"
-                        },
-                        {
-                           "url": "http://www.ubuntupocketguide.com/index_main.html",
-                           "title": "Ubuntu Pocket Guide and Reference"
-                        },
-                        {
-                           "url": "https://help.ubuntu.com/20.04/serverguide/serverguide.pdf",
-                           "title": "Ubuntu Server Guide"
-                        },
-                        {
-                           "url": "https://www.kernel.org/doc/gorman/",
-                           "title": "Understanding the Linux Virtual Memory Manager"
-                        },
-                        {
-                           "url": "http://www.bitsinthewind.com/about-dac/publications/unix-systems-programming",
-                           "title": "UNIX Systems Programming for SVR4"
-                        },
-                        {
-                           "url": "http://upstart.ubuntu.com/cookbook/",
-                           "title": "Upstart Intro, Cookbook and Best Practises"
-                        },
-                        {
-                           "url": "http://www.akkadia.org/drepper/cpumemory.pdf",
-                           "title": "What Every Programmer Should Know About Memory"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lisp",
-                     "entries": [
-                        {
-                           "url": "http://franz.com/resources/educational_resources/cooper.book.pdf",
-                           "title": "Basic Lisp Techniques"
-                        },
-                        {
-                           "url": "http://www.lisperati.com/casting.html",
-                           "title": "Casting Spels in Lisp"
-                        },
-                        {
-                           "url": "http://www.cs.cmu.edu/~dst/LispBook/",
-                           "title": "Common Lisp: A Gentle Introduction to Symbolic Computation"
-                        },
-                        {
-                           "url": "http://www.cse.buffalo.edu/~shapiro/Commonlisp/",
-                           "title": "Common Lisp: An Interactive Approach"
-                        },
-                        {
-                           "url": "http://clqr.boundp.org",
-                           "title": "Common Lisp Quick Reference"
-                        },
-                        {
-                           "url": "http://www.cs.cmu.edu/Groups/AI/html/cltl/mirrors.html",
-                           "title": "Common Lisp the Language, 2nd Edition"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/lispguide.xml",
-                           "title": "Google's Common Lisp Style Guide"
-                        },
-                        {
-                           "url": "http://www.civilized.com/files/lispbook.pdf",
-                           "title": "Interpreting LISP"
-                        },
-                        {
-                           "url": "https://github.com/LispTO/llthw",
-                           "title": "Learn Lisp The Hard Way"
-                        },
-                        {
-                           "url": "http://letoverlambda.com/index.cl/",
-                           "title": "Let Over Lambda - 50 Years of Lisp"
-                        },
-                        {
-                           "url": "https://leanpub.com/lisphackers/read",
-                           "title": "Lisp Hackers: Interviews with 100x More Productive Programmers"
-                        },
-                        {
-                           "url": "https://github.com/google/lisp-koans",
-                           "title": "Lisp Koans"
-                        },
-                        {
-                           "url": "https://leanpub.com/lispwebtales",
-                           "title": "Lisp Web Tales"
-                        },
-                        {
-                           "url": "http://www.paulgraham.com/onlisp.html",
-                           "title": "On Lisp"
-                        },
-                        {
-                           "url": "https://github.com/norvig/paip-lisp",
-                           "title": "Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp"
-                        },
-                        {
-                           "url": "http://www.gigamonkeys.com/book/",
-                           "title": "Practical Common Lisp"
-                        },
-                        {
-                           "url": "https://lispcookbook.github.io/cl-cookbook/",
-                           "title": "The Common Lisp Cookbook"
-                        },
-                        {
-                           "url": "http://www.dreamsongs.com/Files/HOPL2-Uncut.pdf",
-                           "title": "The Evolution of Lisp"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Livecode",
-                     "entries": [
-                        {
-                           "url": "http://www.scribd.com/doc/216789127/LiveCode-userguide",
-                           "title": "LiveCode userguide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Lua",
-                     "entries": [
-                        {
-                           "url": "http://www.lua.org/manual/5.3/",
-                           "title": "Lua 5.3 Reference Manual"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Lua_Programming",
-                           "title": "Lua Programming"
-                        },
-                        {
-                           "url": "https://www.lua.org/pil/contents.html",
-                           "title": "Programming in Lua (first edition)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Make",
-                     "entries": [
-                        {
-                           "url": "https://makefiletutorial.com",
-                           "title": "Makefile tutorial"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/openbook/make3/book/index.html",
-                           "title": "Managing Projects with GNU Make"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Markdown",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/gitbookio/markdown/details",
-                           "title": "Learn Markdown"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Mathematica",
-                     "entries": [
-                        {
-                           "url": "http://www.mathprogramming-intro.org",
-                           "title": "Mathematica® programming: an advanced introduction by Leonid Shifrin"
-                        },
-                        {
-                           "url": "http://mathematica.stackexchange.com/questions/16485/are-you-interested-in-purchasing-david-wagners-power-programming-with-mathemat/22724",
-                           "title": "Power Programming with Mathematica"
-                        },
-                        {
-                           "url": "http://reference.wolfram.com/legacy/v5_2/",
-                           "title": "Stephen Wolfram's The Mathematica Book"
-                        },
-                        {
-                           "url": "http://chortle.ccsu.edu/VectorLessons/index.html",
-                           "title": "Vector Math for 3d Computer Graphics"
-                        },
-                        {
-                           "url": "https://www.wolfram.com/wolfram-u/catalog/product-training/mathematica/",
-                           "title": "Wolfram Mathematica Product Training: Wolfram U"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MATLAB",
-                     "entries": [
-                        {
-                           "url": "http://www.science.smith.edu/~jcardell/Courses/EGR326/Intro-to-MATLAB.pdf",
-                           "title": "An Interactive Introduction to MATLAB"
-                        },
-                        {
-                           "url": "http://www.maths.dundee.ac.uk/software/MatlabNotes.pdf",
-                           "title": "An Introduction to MATLAB"
-                        },
-                        {
-                           "url": "http://www.intechopen.com/books/applications-of-matlab-in-science-and-engineering",
-                           "title": "Applications of MATLAB in Science and Engineering"
-                        },
-                        {
-                           "url": "http://www.mathworks.com/moler/exm/index.html?requestedDomain=www.mathworks.com&nocookie=true",
-                           "title": "Experiments with MATLAB"
-                        },
-                        {
-                           "url": "https://cnx.org/exports/3a643c1f-c1ba-4c2a-8065-317a1f2b1add@18.1.pdf/freshman-engineering-problem-solving-with-matlab-18.1.pdf",
-                           "title": "Freshman Engineering Problem Solving with MATLAB"
-                        },
-                        {
-                           "url": "http://www.mathworks.com/tutorials",
-                           "title": "Interactive Tutorials for MATLAB, Simulink, Signal Processing, Controls, and Computational Mathematics"
-                        },
-                        {
-                           "url": "https://www.mccormick.northwestern.edu/documents/students/undergraduate/introduction-to-matlab.pdf",
-                           "title": "Introduction to MATLAB for Engineering Students"
-                        },
-                        {
-                           "url": "http://www.intechopen.com/books/matlab-a-fundamental-tool-for-scientific-computing-and-engineering-applications-volume-1",
-                           "title": "MATLAB - A Fundamental Tool for Scientific Computing and Engineering Applications - Volume 1"
-                        },
-                        {
-                           "url": "http://www.intechopen.com/books/matlab-a-ubiquitous-tool-for-the-practical-engineer",
-                           "title": "MATLAB - A Ubiquitous Tool for the Practical Engineer"
-                        },
-                        {
-                           "url": "http://www.intechopen.com/books/matlab-for-engineers-applications-in-control-electrical-engineering-it-and-robotics",
-                           "title": "MATLAB for Engineers: Applications in Control, Electrical Engineering, IT and Robotics"
-                        },
-                        {
-                           "url": "https://goalkicker.com/MATLABBook",
-                           "title": "MATLAB Notes for professionals"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/MATLAB_Programming",
-                           "title": "MATLAB Programming"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/matlab",
-                           "title": "MATLAB Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://www.mathworks.com/moler/index_ncm.html?requestedDomain=www.mathworks.com&nocookie=true",
-                           "title": "Numerical Computing with MATLAB"
-                        },
-                        {
-                           "url": "http://greenteapress.com/matlab/index.html",
-                           "title": "Physical Modeling in MATLAB"
-                        },
-                        {
-                           "url": "https://www.math.ust.hk/~machas/scientific-computing.pdf",
-                           "title": "Scientific Computing"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Maven",
-                     "entries": [
-                        {
-                           "url": "https://books.sonatype.com/m2eclipse-book/reference/index.html",
-                           "title": "Developing with Eclipse and Maven"
-                        },
-                        {
-                           "url": "http://books.sonatype.com/mvnex-book/reference/public-book.html",
-                           "title": "Maven by Example"
-                        },
-                        {
-                           "url": "http://books.sonatype.com/mvnref-book/reference/public-book.html",
-                           "title": "Maven: The Complete Reference"
-                        },
-                        {
-                           "url": "http://books.sonatype.com/nexus-book/reference/",
-                           "title": "Repository Management with Nexus"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Mercurial",
-                     "entries": [
-                        {
-                           "url": "https://hginit.github.io",
-                           "title": "Hg Init: a Mercurial Tutorial"
-                        },
-                        {
-                           "url": "http://hgbook.red-bean.com",
-                           "title": "Mercurial: The Definitive Guide"
-                        },
-                        {
-                           "url": "https://book.mercurial-scm.org",
-                           "title": "Mercurial: The Definitive Guide 2nd edition"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Mercury",
-                     "entries": [
-                        {
-                           "url": "http://www.mercurylang.org/information/doc-release/user_guide.pdf",
-                           "title": "The Mercury Users' Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Modelica",
-                     "entries": [
-                        {
-                           "url": "http://book.xogeny.com",
-                           "title": "Modelica by Example"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "MySQL",
-                     "entries": [
-                        {
-                           "url": "https://dev.mysql.com/doc/mysql-tutorial-excerpt/8.0/en/tutorial.html",
-                           "title": "MySQL 8.0 Tutorial Excerpt"
-                        },
-                        {
-                           "url": "http://www.techotopia.com/index.php/MySQL_Essentials",
-                           "title": "MySQL Essentials"
-                        },
-                        {
-                           "url": "https://goalkicker.com/MySQLBook/",
-                           "title": "MySQL Notes for Professionals"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Neo4J",
-                     "entries": [
-                        {
-                           "url": "https://neo4j.com/fullstack-graphql-applications-with-grandstack/",
-                           "title": "Fullstack GraphQL Applications with GRANDStack – Essential Excerpts"
-                        },
-                        {
-                           "url": "https://neo4j.com/graph-algorithms-book/",
-                           "title": "Graph Algorithms: Practical Examples in Apache Spark and Neo4j"
-                        },
-                        {
-                           "url": "http://neo4j.com/books/graph-databases/",
-                           "title": "Graph Databases 2nd edition"
-                        },
-                        {
-                           "url": "https://neo4j.com/graph-databases-for-dummies/",
-                           "title": "Graph Databases For Dummies"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": ".NET Core",
-                     "entries": [
-                        {
-                           "url": "https://github.com/thangchung/clean-code-dotnet",
-                           "title": "Clean Code .NET"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/succinctly-free-ebooks/entity-frame-work-core-succinctly",
-                           "title": "Entity Framework Core Succinctly"
-                        },
-                        {
-                           "url": "https://docs.microsoft.com/en-us/dotnet/",
-                           "title": ".NET documentation - Microsoft Docs"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/using-netcore-docker-and-kubernetes-succinctly",
-                           "title": "Using .NET Core, Docker, and Kubernetes Succinctly"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": ".NET Framework",
-                     "entries": [
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/akka_net_succinctly",
-                           "title": "Akka.NET Succinctly"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/application_security_in_net_succinctly",
-                           "title": "Application Security in .NET Succinctly"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/cryptography_in_net_succinctly",
-                           "title": "Cryptography in .NET Succinctly"
-                        },
-                        {
-                           "url": "http://weblogs.asp.net/zeeshanhirani/my-christmas-present-to-the-entity-framework-community",
-                           "title": "Entity Framework"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Game_Creation_with_XNA",
-                           "title": "Game Creation with XNA"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/getting-the-most-from-linqpad-succinctly",
-                           "title": "Getting the Most from LINQPad Succinctly"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/monogame_succinctly",
-                           "title": "MonoGame Succinctly"
-                        },
-                        {
-                           "url": "http://foxcentral.net/microsoft/NETforVFPDevelopers.htm",
-                           "title": ".NET for Visual FoxPro Developers"
-                        },
-                        {
-                           "url": "https://goalkicker.com/DotNETFrameworkBook/",
-                           "title": ".NET Framework Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/library/net-performance-testing-and-optimization-the-complete-guide",
-                           "title": ".NET Performance Testing and Optimization - The Complete Guide"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/nuget-in-house-succinctly",
-                           "title": "NuGet In-House Succinctly"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/rider-succinctly",
-                           "title": "Rider Succinctly"
-                        },
-                        {
-                           "url": "https://assets.red-gate.com/community/books/under-the-hood-of-net-memory-management.pdf",
-                           "title": "Under the Hood of .NET Memory Management"
-                        },
-                        {
-                           "url": "http://www.infoq.com/minibooks/vsnettt",
-                           "title": "Visual Studio .NET Tips and Tricks"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/visual-studio-2019-succinctly",
-                           "title": "Visual Studio 2019 Succinctly"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Nim",
-                     "entries": [
-                        {
-                           "url": "http://ssalewski.de/nimprogramming.html",
-                           "title": "Computer Programming with the Nim Programming Language"
-                        },
-                        {
-                           "url": "https://narimiran.github.io/nim-basics",
-                           "title": "Nim Basics"
-                        },
-                        {
-                           "url": "https://nim-by-example.github.io",
-                           "title": "Nim by Example"
-                        },
-                        {
-                           "url": "https://xmonader.github.io/nimdays",
-                           "title": "Nim Days"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "NoSQL",
-                     "entries": [
-                        {
-                           "url": "http://guide.couchdb.org",
-                           "title": "CouchDB: The Definitive Guide"
-                        },
-                        {
-                           "url": "http://publications.lib.chalmers.se/records/fulltext/155048.pdf",
-                           "title": "Extracting Data from NoSQL Databases: A Step towards Interactive Visual Analysis of NoSQL Data"
-                        },
-                        {
-                           "url": "http://graphdatabases.com",
-                           "title": "Graph Databases"
-                        },
-                        {
-                           "url": "https://www.tutorialspoint.com/mongodb",
-                           "title": "Introduction to MongoDB"
-                        },
-                        {
-                           "url": "https://github.com/chicagoruby/MongoDB_Koans",
-                           "title": "MongoDB Koans"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/mongodb",
-                           "title": "MongoDB Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "http://www.christof-strauch.de/nosqldbs.pdf",
-                           "title": "NoSQL Databases"
-                        },
-                        {
-                           "url": "http://openmymind.net/2011/3/28/The-Little-MongoDB-Book/",
-                           "title": "The Little MongoDB Book"
-                        },
-                        {
-                           "url": "http://openmymind.net/2012/1/23/The-Little-Redis-Book/",
-                           "title": "The Little Redis Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Oberon",
-                     "entries": [
-                        {
-                           "url": "https://inf.ethz.ch/personal/wirth/AD.pdf",
-                           "title": "Algorithms and Data-Structures"
-                        },
-                        {
-                           "url": "http://ssw.jku.at/Research/Books/Oberon2.pdf",
-                           "title": "Object-Oriented Programming in Oberon-2"
-                        },
-                        {
-                           "url": "https://www.inf.ethz.ch/personal/wirth/ProgInOberonWR.pdf",
-                           "title": "Programming in Oberon"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Objective-C",
-                     "entries": [
-                        {
-                           "url": "https://github.com/google/styleguide/blob/gh-pages/objcguide.md",
-                           "title": "Google's Objective-C Style Guide"
-                        },
-                        {
-                           "url": "https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/OOP_ObjC/Introduction/Introduction.html#//apple_ref/doc/uid/TP40005149",
-                           "title": "Object-Oriented Programming with Objective-C"
-                        },
-                        {
-                           "url": "https://goalkicker.com/ObjectiveCBook/",
-                           "title": "Objective-C Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/objective-c",
-                           "title": "Objective-C Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/Introduction/Introduction.html",
-                           "title": "Programming With Objective-C"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "OCaml",
-                     "entries": [
-                        {
-                           "url": "http://caml.inria.fr/pub/docs/oreilly-book/",
-                           "title": "Developing Applications With Objective Caml"
-                        },
-                        {
-                           "url": "https://www.cs.cornell.edu/courses/cs3110/2019sp/textbook/",
-                           "title": "Functional Programming in OCaml"
-                        },
-                        {
-                           "url": "https://ocaml.xyz/book/",
-                           "title": "OCaml Scientific Computing"
-                        },
-                        {
-                           "url": "https://dev.realworldocaml.org/toc.html",
-                           "title": "Real World OCaml"
-                        },
-                        {
-                           "url": "http://greenteapress.com/thinkocaml/index.html",
-                           "title": "Think OCaml"
-                        },
-                        {
-                           "url": "http://ocaml.github.io/ocamlunix/",
-                           "title": "Unix System Programming in OCaml"
-                        },
-                        {
-                           "url": "http://pauillac.inria.fr/~remy/cours/appsem/",
-                           "title": "Using, Understanding, and Unraveling The OCaml Language: From Practice to Theory and vice versa"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Octave",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Octave_Programming_Tutorial",
-                           "title": "Octave Programming"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "OpenMP",
-                     "entries": [
-                        {
-                           "url": "http://bisqwit.iki.fi/story/howto/openmp/",
-                           "title": "A Guide To OpenMP"
-                        },
-                        {
-                           "url": "http://www.openmp.org/mp-documents/OpenMP4.0.0.pdf",
-                           "title": "OpenMP Application Programming Interface Standard Version 4.0"
-                        },
-                        {
-                           "url": "https://www.openmp.org/wp-content/uploads/OpenMP-API-Specification-5.0.pdf",
-                           "title": "OpenMP Application Programming Interface Standard Version 5.0"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "OpenResty",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/openresty/programming-openresty/details",
-                           "title": "Programming OpenResty"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "OpenSCAD",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/OpenSCAD_User_Manual",
-                           "title": "OpenSCAD User Manual"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TrueOS",
-                     "entries": [
-                        {
-                           "url": "https://www.trueos.org/handbook/trueos.html",
-                           "title": "TrueOS® Users Handbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Perl",
-                     "entries": [
-                        {
-                           "url": "https://www.perl.org/books/beginning-perl/",
-                           "title": "Beginning Perl"
-                        },
-                        {
-                           "url": "https://datamungingwithperl.com",
-                           "title": "Data Munging with Perl"
-                        },
-                        {
-                           "url": "http://masonbook.houseabsolute.com/book/",
-                           "title": "Embedding Perl in HTML with Mason"
-                        },
-                        {
-                           "url": "http://cslibrary.stanford.edu/108/EssentialPerl.pdf",
-                           "title": "Essential Perl"
-                        },
-                        {
-                           "url": "http://www.billhails.net/Book/",
-                           "title": "Exploring Programming Language Architecture in Perl"
-                        },
-                        {
-                           "url": "http://www.extremeperl.org/bk/home",
-                           "title": "Extreme Perl"
-                        },
-                        {
-                           "url": "http://hop.perl.plover.com/book/",
-                           "title": "Higher-Order Perl"
-                        },
-                        {
-                           "url": "https://www.perl.org/books/impatient-perl/",
-                           "title": "Impatient Perl"
-                        },
-                        {
-                           "url": "http://www.greenteapress.com/perl/",
-                           "title": "Learning Perl The Hard Way"
-                        },
-                        {
-                           "url": "http://www.onyxneon.com/books/modern_perl/",
-                           "title": "Modern Perl 5"
-                        },
-                        {
-                           "url": "http://lwp.interglacial.com/index.html",
-                           "title": "Perl & LWP"
-                        },
-                        {
-                           "url": "http://www.faqs.org/docs/perl5int/",
-                           "title": "Perl 5 Internals"
-                        },
-                        {
-                           "url": "http://www.globalspin.com/thebook/",
-                           "title": "Perl for the Web"
-                        },
-                        {
-                           "url": "https://goalkicker.com/PerlBook/",
-                           "title": "Perl Notes for Professionals"
-                        },
-                        {
-                           "url": "https://learnbyexample.github.io/learn_perl_oneliners/",
-                           "title": "Perl one-liners cookbook"
-                        },
-                        {
-                           "url": "http://perltraining.com.au/notes.html",
-                           "title": "Perl Training Australia - Course Notes"
-                        },
-                        {
-                           "url": "http://handbook.plackperl.org",
-                           "title": "Plack Handbook"
-                        },
-                        {
-                           "url": "https://github.com/PerlGameDev/SDL_Manual",
-                           "title": "SDL::Manual Writing Games in Perl"
-                        },
-                        {
-                           "url": "http://template-toolkit.org/docs/index.html",
-                           "title": "Template Toolkit Documentation"
-                        },
-                        {
-                           "url": "https://github.com/castaway/dbix-class-book",
-                           "title": "The DBIx-Class Book"
-                        },
-                        {
-                           "url": "http://sourceforge.net/projects/pdl/files/PDL_2013/PDL-Book/PDL-Book-20130322.pdf/download",
-                           "title": "The PDL Book"
-                        },
-                        {
-                           "url": "http://www.oreilly.com/openbook/webclient/",
-                           "title": "Web Client Programming with Perl"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PHP",
-                     "entries": [
-                        {
-                           "url": "https://github.com/jupeter/clean-code-php",
-                           "title": "Clean Code PHP"
-                        },
-                        {
-                           "url": "http://www.informit.com/content/images/013147149X/downloads/013147149X_book.pdf",
-                           "title": "PHP 5 Power Programming"
-                        },
-                        {
-                           "url": "https://phpbestpractices.org",
-                           "title": "PHP Best Practices"
-                        },
-                        {
-                           "url": "http://www.phpinternalsbook.com",
-                           "title": "PHP Internals Book"
-                        },
-                        {
-                           "url": "https://goalkicker.com/PHPBook/",
-                           "title": "PHP Notes for Professionals"
-                        },
-                        {
-                           "url": "http://daylerees.com/php-pandas/",
-                           "title": "PHP Pandas"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/PHP_Programming",
-                           "title": "PHP Programming"
-                        },
-                        {
-                           "url": "https://phpreferencebook.com/pdf/download/",
-                           "title": "PHP Reference: Beginner to Intermediate PHP5"
-                        },
-                        {
-                           "url": "http://phpsec.org/projects/guide/",
-                           "title": "PHP Security Guide"
-                        },
-                        {
-                           "url": "http://www.phptherightway.com",
-                           "title": "PHP: The Right Way"
-                        },
-                        {
-                           "url": "https://phpunit.de/manual/current/en/phpunit-book.pdf",
-                           "title": "PHPUnit Manual"
-                        },
-                        {
-                           "url": "http://www.hackingwithphp.com",
-                           "title": "Practical PHP Programming"
-                        },
-                        {
-                           "url": "http://www.giorgiosironi.com/2009/12/practical-php-testing-is-here.html",
-                           "title": "Practical PHP Testing"
-                        },
-                        {
-                           "url": "https://phpsecurity.readthedocs.org/en/latest/",
-                           "title": "Survive The Deep End: PHP Security"
-                        },
-                        {
-                           "url": "https://paragonie.com/book/pecl-libsodium",
-                           "title": "Using Libsodium in PHP Projects"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "CakePHP",
-                           "entries": [
-                              {
-                                 "url": "http://book.cakephp.org/2.0/_downloads/en/CakePHPCookbook.pdf",
-                                 "title": "CakePHP Cookbook 2.x"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "CodeIgniter",
-                           "entries": [
-                              {
-                                 "url": "https://codeigniter.com/userguide3/index.html",
-                                 "title": "CodeIgniter 3 User Guide"
-                              },
-                              {
-                                 "url": "https://codeigniter.com/user_guide/index.html",
-                                 "title": "CodeIgniter 4 User Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Drupal",
-                           "entries": [
-                              {
-                                 "url": "https://www.drupal.org/files/tiny-book-of-rules.pdf",
-                                 "title": "The Tiny Book of Rules"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Laravel",
-                           "entries": [
-                              {
-                                 "url": "https://laraveldaily.com/wp-content/uploads/2020/04/laravel-tips-2020-04.pdf",
-                                 "title": "100 (and counting) Laravel Quick Tips"
-                              },
-                              {
-                                 "url": "https://leanpub.com/laravel-5",
-                                 "title": "Laravel 5.x Official Documentation. Synced Daily"
-                              },
-                              {
-                                 "url": "http://www.laravelbestpractices.com",
-                                 "title": "Laravel Best Practices"
-                              },
-                              {
-                                 "url": "http://daylerees.com/codebright",
-                                 "title": "Laravel: Code Bright"
-                              },
-                              {
-                                 "url": "http://daylerees.com/codehappy",
-                                 "title": "Laravel: Code Happy"
-                              },
-                              {
-                                 "url": "https://daylerees.com/codesmart/",
-                                 "title": "Laravel: Code Smart"
-                              },
-                              {
-                                 "url": "https://leanpub.com/laravelcollectionsunraveled",
-                                 "title": "Laravel Collections Unraveled"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Symfony",
-                           "entries": [
-                              {
-                                 "url": "https://symfony.com/doc/5.0/the-fast-track/en/index.html",
-                                 "title": "Symfony 5: The Fast Track"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20181017123206/https://symfony.com/pdf/Symfony_best_practices_4.1.pdf",
-                                 "title": "The Symfony Best practices 4.1.x"
-                              },
-                              {
-                                 "url": "https://symfony.com/doc/2.8/index.html",
-                                 "title": "The Symfony Book 2.8.x"
-                              },
-                              {
-                                 "url": "https://symfony.com/doc/3.4/index.html",
-                                 "title": "The Symfony Book 3.4.x"
-                              },
-                              {
-                                 "url": "https://symfony.com/doc/4.4/index.html",
-                                 "title": "The Symfony Book 4.4.x"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Zend",
-                           "entries": [
-                              {
-                                 "url": "https://olegkrivtsov.github.io/using-zend-framework-3-book/html/",
-                                 "title": "Using Zend Framework 3"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "PicoLisp",
-                     "entries": [
-                        {
-                           "url": "https://github.com/tj64/picolisp-by-example",
-                           "title": "PicoLisp by Example"
-                        },
-                        {
-                           "url": "https://github.com/tj64/picolisp-works",
-                           "title": "PicoLisp Works"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PostgreSQL",
-                     "entries": [
-                        {
-                           "url": "http://www.postgresql.org/docs/",
-                           "title": "Postgres Official Documentation"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/postgres",
-                           "title": "Postgres Succinctly"
-                        },
-                        {
-                           "url": "https://www.tutorialspoint.com/postgresql",
-                           "title": "PostgreSQL Tutorial"
-                        },
-                        {
-                           "url": "http://www.faqs.org/docs/ppbook/book1.htm",
-                           "title": "Practical PostgreSQL"
-                        },
-                        {
-                           "url": "http://www.interdb.jp/pg",
-                           "title": "The Internals of PostgreSQL for database administrators and system developers"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "PowerShell",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/aunixpersonsguidetopowershell",
-                           "title": "A Unix Person's Guide to PowerShell"
-                        },
-                        {
-                           "url": "https://leanpub.com/creatinghtmlreportsinwindowspowershell",
-                           "title": "Creating HTML Reports in PowerShell"
-                        },
-                        {
-                           "url": "https://leanpub.com/devopstheopsperspective",
-                           "title": "DevOps: The Ops Perspective"
-                        },
-                        {
-                           "url": "https://leanpub.com/ditchexcelmakinghistoricalandtrendreportsinpowershell",
-                           "title": "Ditch Excel: Making Historical & Trend Reports in PowerShell"
-                        },
-                        {
-                           "url": "https://ravichaganti.com/ebooks/AlaymansguidetoPowerShell2remotingv2.pdf",
-                           "title": "Layman’s Guide to PowerShell 2.0 remoting"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/learn-powershell-core-60",
-                           "title": "Learn PowerShell Core 6.0"
-                        },
-                        {
-                           "url": "https://learnxinyminutes.com/docs/powershell/",
-                           "title": "Learn PowerShell in Y Minutes"
-                        },
-                        {
-                           "url": "http://community.idera.com/powershell/powertips/b/ebookv2#pi619PostSortOrder=Ascending",
-                           "title": "Mastering PowerShell v2"
-                        },
-                        {
-                           "url": "https://leanpub.com/powershell101",
-                           "title": "PowerShell 101: The No-Nonsense Beginner’s Guide to PowerShell"
-                        },
-                        {
-                           "url": "http://www.jonathanmedd.net/wp-content/uploads/2010/09/PowerShell_2_One_Cmdlet_at_a_Time.pdf",
-                           "title": "PowerShell 2.0 – One CMDLET At A Time"
-                        },
-                        {
-                           "url": "http://goalkicker.com/PowerShellBook/",
-                           "title": "PowerShell Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/powershell",
-                           "title": "PowerShell Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "https://leanpub.com/powershelltips",
-                           "title": "PowerShell Tips to Write By"
-                        },
-                        {
-                           "url": "https://leanpub.com/secretsofpowershellremoting",
-                           "title": "Secrets of PowerShell Remoting"
-                        },
-                        {
-                           "url": "https://leanpub.com/thebigbookofpowershellerrorhandling",
-                           "title": "The Big Book of PowerShell Error Handling"
-                        },
-                        {
-                           "url": "https://leanpub.com/thebigbookofpowershellgotchas",
-                           "title": "The Big Book of PowerShell Gotchas"
-                        },
-                        {
-                           "url": "https://leanpub.com/themonadmanifestoannotated",
-                           "title": "The Monad Manifesto - Annotated"
-                        },
-                        {
-                           "url": "https://leanpub.com/windowspowershellnetworkingguide",
-                           "title": "The PowerShell + DevOps Global Summit Manual for Summiteers"
-                        },
-                        {
-                           "url": "https://leanpub.com/whypowershell",
-                           "title": "Why PowerShell?"
-                        },
-                        {
-                           "url": "https://leanpub.com/windowspowershellnetworkingguide",
-                           "title": "Windows PowerShell Networking Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Processing",
-                     "entries": [
-                        {
-                           "url": "http://natureofcode.com/book/",
-                           "title": "The Nature of Code: Simulating Natural Systems with Processing"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Prolog",
-                     "entries": [
-                        {
-                           "url": "http://www.amzi.com/AdventureInProlog/",
-                           "title": "Adventure in Prolog"
-                        },
-                        {
-                           "url": "http://bookboon.com/en/applications-of-prolog-ebook",
-                           "title": "Applications of Prolog"
-                        },
-                        {
-                           "url": "http://arxiv.org/abs/0911.2899",
-                           "title": "Coding Guidelines for Prolog"
-                        },
-                        {
-                           "url": "http://www.cis.upenn.edu/~matuszek/Concise%20Guides/Concise%20Prolog.html",
-                           "title": "Concise Intro to Prolog"
-                        },
-                        {
-                           "url": "http://www.amzi.com/ExpertSystemsInProlog/",
-                           "title": "Expert Systems in Prolog"
-                        },
-                        {
-                           "url": "http://www.gprolog.org/manual/gprolog.pdf",
-                           "title": "GNU Prolog Manual"
-                        },
-                        {
-                           "url": "http://www.j-paine.org/prolog/mathnotes/files/pms/pms.html",
-                           "title": "Introduction to Prolog for Mathematicians"
-                        },
-                        {
-                           "url": "http://www.learnprolognow.org",
-                           "title": "Learn Prolog Now!"
-                        },
-                        {
-                           "url": "http://www.ida.liu.se/~ulfni53/lpp/",
-                           "title": "Logic, Programming and Prolog (2ed)"
-                        },
-                        {
-                           "url": "http://cs.union.edu/~striegnk/courses/nlp-with-prolog/html/",
-                           "title": "Natural Language Processing Techniques in Prolog"
-                        },
-                        {
-                           "url": "http://www.mtome.com/Publications/PNLA/pnla-digital.html",
-                           "title": "Prolog and Natural - Language Analysis"
-                        },
-                        {
-                           "url": "https://sites.google.com/site/prologforprogrammers/",
-                           "title": "Prolog for Programmers"
-                        },
-                        {
-                           "url": "https://sites.google.com/site/prologsite/prolog-problems",
-                           "title": "Prolog Problems"
-                        },
-                        {
-                           "url": "http://bookboon.com/en/prolog-techniques-applications-of-prolog-ebook",
-                           "title": "Prolog Techniques"
-                        },
-                        {
-                           "url": "http://www.cpp.edu/~jrfisher/www/prolog_tutorial/contents.html",
-                           "title": "Prolog Tutorial"
-                        },
-                        {
-                           "url": "https://mitpress.mit.edu/books/art-prolog-second-edition",
-                           "title": "The Art of Prolog, Second Edition"
-                        },
-                        {
-                           "url": "https://dtai.cs.kuleuven.be/ppcbook/",
-                           "title": "The First 10 Prolog Programming Contests"
-                        },
-                        {
-                           "url": "http://wambook.sourceforge.net",
-                           "title": "Warren's Abstract Machine: A Tutorial Reconstruction"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Constraint Logic Programming (extended Prolog)",
-                           "entries": [
-                              {
-                                 "url": "http://anclp.pl",
-                                 "title": "A Gentle Guide to Constraint Logic Programming via ECLiPSe"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "PureScript",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/purescript/read",
-                           "title": "PureScript By Example"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Python",
-                     "entries": [
-                        {
-                           "url": "https://learnbyexample.github.io/100_page_python_intro/",
-                           "title": "100 Page Python Intro"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/learning/20-python-libraries-you-arent-using-but-should",
-                           "title": "20 Python Libraries You Aren't Using (But Should)"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/A_Beginner%27s_Python_Tutorial",
-                           "title": "A Beginner's Python Tutorial"
-                        },
-                        {
-                           "url": "https://python.swaroopch.com",
-                           "title": "A Byte of Python"
-                        },
-                        {
-                           "url": "https://github.com/RafeKettler/magicmethods",
-                           "title": "A Guide to Python's Magic Methods"
-                        },
-                        {
-                           "url": "http://www.oreilly.com/programming/free/files/a-whirlwind-tour-of-python.pdf",
-                           "title": "A Whirlwind Tour of Python"
-                        },
-                        {
-                           "url": "https://www.cosmicpython.com/book/preface.html",
-                           "title": "Architecture Patterns with Python"
-                        },
-                        {
-                           "url": "https://automatetheboringstuff.com/2e/chapter0/",
-                           "title": "Automate the Boring Stuff with Python, 2nd Edition: Practical Programming for Total Beginners"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bgpython/",
-                           "title": "Beej's Guide to Python Programming - For Beginners"
-                        },
-                        {
-                           "url": "https://inventwithpython.com/beyond/",
-                           "title": "Beyond the Basic Stuff with Python"
-                        },
-                        {
-                           "url": "https://biopython.org/DIST/docs/tutorial/Tutorial.pdf",
-                           "title": "Biopython Tutorial and Cookbook"
-                        },
-                        {
-                           "url": "http://github.com/thewhitetulip/build-app-with-python-antitextbook",
-                           "title": "Build applications in Python the antitextbook"
-                        },
-                        {
-                           "url": "https://slott56.github.io/building-skills-oo-design-book/build/html/",
-                           "title": "Building Skills in Object-Oriented Design, V4"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20190918094202/http://www.itmaybeahack.com/book/python-2.6/latex/BuildingSkillsinPython.pdf",
-                           "title": "Building Skills in Python"
-                        },
-                        {
-                           "url": "https://www.pycabook.com",
-                           "title": "Clean Architectures in Python"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180411011411/http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html",
-                           "title": "Code Like a Pythonista: Idiomatic Python"
-                        },
-                        {
-                           "url": "https://www.codecademy.com/learn/python",
-                           "title": "CodeCademy Python"
-                        },
-                        {
-                           "url": "http://composingprograms.com",
-                           "title": "Composing Programs"
-                        },
-                        {
-                           "url": "https://inventwithpython.com/cracking/",
-                           "title": "Cracking Codes with Python"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20161016153130/http://www.brpreiss.com/books/opus7/html/book.html",
-                           "title": "Data Structures and Algorithms in Python"
-                        },
-                        {
-                           "url": "https://diveintopython3.problemsolving.io",
-                           "title": "Dive into Python 3"
-                        },
-                        {
-                           "url": "https://www.labri.fr/perso/nrougier/from-python-to-numpy/",
-                           "title": "From Python to NumPy"
-                        },
-                        {
-                           "url": "https://www.fullstackpython.com",
-                           "title": "Full Stack Python"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/ideas/functional-programming-in-python",
-                           "title": "Functional Programming in Python"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20191005170430/http://python.cs.southern.edu/pythonbook/pythonbook.pdf",
-                           "title": "Fundamentals of  Python Programming"
-                        },
-                        {
-                           "url": "https://developers.google.com/edu/python/",
-                           "title": "Google's Python Class"
-                        },
-                        {
-                           "url": "https://google.github.io/styleguide/pyguide.html",
-                           "title": "Google's Python Style Guide"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/learning/hadoop-with-python",
-                           "title": "Hadoop with Python"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebook/hands-on-natural-language-processing-with-python/9781789139495",
-                           "title": "Hands-On Natural Language Processing with Python"
-                        },
-                        {
-                           "url": "http://docs.python-guide.org/en/latest/",
-                           "title": "Hitchhiker's Guide to Python!"
-                        },
-                        {
-                           "url": "https://assets.digitalocean.com/books/python/how-to-code-in-python.pdf",
-                           "title": "How to Code in Python 3"
-                        },
-                        {
-                           "url": "http://www.oreilly.com/programming/free/files/how-to-make-mistakes-in-python.pdf",
-                           "title": "How to Make Mistakes in Python"
-                        },
-                        {
-                           "url": "https://runestone.academy/runestone/books/published/thinkcspy/index.html",
-                           "title": "How to Think Like a Computer Scientist: Learning with Python, Interactive Edition"
-                        },
-                        {
-                           "url": "https://book.pythontips.com/en/latest/",
-                           "title": "Intermediate Python"
-                        },
-                        {
-                           "url": "http://opentechschool.github.io/python-beginners/en/",
-                           "title": "Introduction to Programming with Python"
-                        },
-                        {
-                           "url": "http://kracekumar.com/post/71171551647/introduction-to-python",
-                           "title": "Introduction to Python"
-                        },
-                        {
-                           "url": "https://www.kevinsheppard.com/files/teaching/python/notes/python_introduction_2020.pdf",
-                           "title": "Introduction to Python for Econometrics, Statistics and Numerical Analysis"
-                        },
-                        {
-                           "url": "https://inventwithpython.com/invent4thed/",
-                           "title": "Invent Your Own Computer Games With Python"
-                        },
-                        {
-                           "url": "http://learnpythonbreakpython.com",
-                           "title": "Learn Python, Break Python"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/learn-python-programming-second-edition",
-                           "title": "Learn Python Programming, Second Edition"
-                        },
-                        {
-                           "url": "https://www.ida.liu.se/~732A47/literature/PythonBook.pdf",
-                           "title": "Learn to Program Using Python"
-                        },
-                        {
-                           "url": "http://www.alan-g.me.uk",
-                           "title": "Learning to Program"
-                        },
-                        {
-                           "url": "https://github.com/jrjohansson/scientific-python-lectures",
-                           "title": "Lectures on scientific computing with python"
-                        },
-                        {
-                           "url": "https://inventwithpython.com/pygame/chapters/",
-                           "title": "Making Games with Python & Pygame"
-                        },
-                        {
-                           "url": "https://akuli.github.io/math-tutorial/",
-                           "title": "Math for programmers (using python)"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/modsimpy/",
-                           "title": "Modeling and Simulation in Python"
-                        },
-                        {
-                           "url": "http://www.clips.ua.ac.be/sites/default/files/modeling-creativity.pdf",
-                           "title": "Modeling Creativity: Case Studies in Python"
-                        },
-                        {
-                           "url": "https://medium.com/towards-artificial-intelligence/natural-language-processing-nlp-with-python-tutorial-for-beginners-1f54e610a1a0",
-                           "title": "Natural Language Processing (NLP) with Python — Tutorial"
-                        },
-                        {
-                           "url": "http://www.nltk.org/book/",
-                           "title": "Natural Language Processing with Python"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Non-Programmer%27s_Tutorial_for_Python_3",
-                           "title": "Non-Programmer's Tutorial for Python 3"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/ideas/picking-a-python-version",
-                           "title": "Picking a Python Version: A Manifesto"
-                        },
-                        {
-                           "url": "http://python3porting.com",
-                           "title": "Porting to Python 3: An In-Depth Guide"
-                        },
-                        {
-                           "url": "https://launchpadlibrarian.net/165489933/PracticalProgrammingPython2014.pdf",
-                           "title": "Practical Programming in Python"
-                        },
-                        {
-                           "url": "https://learnbyexample.github.io/practice_python_projects/",
-                           "title": "Practice Python Projects"
-                        },
-                        {
-                           "url": "https://runestone.academy/runestone/books/published/pythonds3/index.html",
-                           "title": "Problem Solving with Algorithms and Data Structures using Python"
-                        },
-                        {
-                           "url": "http://programarcadegames.com",
-                           "title": "Program Arcade Games With Python And Pygame"
-                        },
-                        {
-                           "url": "http://programmingcomputervision.com/downloads/ProgrammingComputerVision_CCdraft.pdf",
-                           "title": "Programming Computer Vision with Python"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180921063136/http://buildingskills.itmaybeahack.com/book/programming-2.6/latex/ProgrammingforNon-Programmers.pdf",
-                           "title": "Programming for Non-Programmers, Release 2.6.2"
-                        },
-                        {
-                           "url": "https://pysdr.org",
-                           "title": "PySDR: A Guide to SDR and DSP using Python"
-                        },
-                        {
-                           "url": "https://python101.pythonlibrary.org",
-                           "title": "Python 101"
-                        },
-                        {
-                           "url": "https://docs.python.org/2/download.html",
-                           "title": "Python 2 Official Documentation"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20171013204449/http://infohost.nmt.edu/tcc/help/pubs/python27/python27.pdf",
-                           "title": "Python 2.7 quick reference"
-                        },
-                        {
-                           "url": "https://docs.python.org/3/download.html",
-                           "title": "Python 3 Official Documentation"
-                        },
-                        {
-                           "url": "https://github.com/Akuli/python-tutorial",
-                           "title": "Python 3 Tutorial"
-                        },
-                        {
-                           "url": "https://jakevdp.github.io/PythonDataScienceHandbook",
-                           "title": "Python Data Science Handbook"
-                        },
-                        {
-                           "url": "http://py4e.com/book",
-                           "title": "Python for Everybody"
-                        },
-                        {
-                           "url": "http://www.pythonlearn.com/book.php",
-                           "title": "Python for Informatics: Exploring Information"
-                        },
-                        {
-                           "url": "http://pymbook.readthedocs.org/en/latest/",
-                           "title": "Python for you and me"
-                        },
-                        {
-                           "url": "http://pymbook.readthedocs.org/en/py3/",
-                           "title": "Python for you and me"
-                        },
-                        {
-                           "url": "http://safehammad.com/downloads/python-idioms-2014-01-16.pdf",
-                           "title": "Python Idioms"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/ideas/python-in-education",
-                           "title": "Python in Education"
-                        },
-                        {
-                           "url": "http://www.greenteapress.com/pythonhydro/pythonhydro.html",
-                           "title": "Python in Hydrology"
-                        },
-                        {
-                           "url": "https://github.com/gregmalcolm/python_koans",
-                           "title": "Python Koans"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/python-machine-learning-example",
-                           "title": "Python Machine Learning By Example"
-                        },
-                        {
-                           "url": "https://pymotw.com/3/",
-                           "title": "Python Module of the Week"
-                        },
-                        {
-                           "url": "http://goalkicker.com/PythonBook/",
-                           "title": "Python Notes for Professionals"
-                        },
-                        {
-                           "url": "http://anandology.com/python-practice-book/index.html",
-                           "title": "Python Practice Book"
-                        },
-                        {
-                           "url": "http://pythonpracticeprojects.com",
-                           "title": "Python Practice Projects"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Python_Programming",
-                           "title": "Python Programming"
-                        },
-                        {
-                           "url": "https://upload.wikimedia.org/wikipedia/commons/9/91/Python_Programming.pdf",
-                           "title": "Python Programming"
-                        },
-                        {
-                           "url": "https://pythonnumericalmethods.berkeley.edu/notebooks/Index.html",
-                           "title": "Python Programming And Numerical Methods: A Guide For Engineers And Scientists"
-                        },
-                        {
-                           "url": "https://www.tutorialspoint.com/python",
-                           "title": "Python Tutorial"
-                        },
-                        {
-                           "url": "http://scipy-lectures.github.io",
-                           "title": "Scipy Lecture Notes"
-                        },
-                        {
-                           "url": "http://www-inst.eecs.berkeley.edu/~cs61a/sp12/book/",
-                           "title": "SICP in Python"
-                        },
-                        {
-                           "url": "https://www.slitherintopython.com",
-                           "title": "Slither into Python: An introduction to Python for beginners"
-                        },
-                        {
-                           "url": "http://python3porting.com",
-                           "title": "Suporting Python 3: An In-Depth Guide"
-                        },
-                        {
-                           "url": "http://www.obeythetestinggoat.com/pages/book.html",
-                           "title": "Test-Driven Web Development with Python"
-                        },
-                        {
-                           "url": "http://gnosis.cx/TPiP/",
-                           "title": "Text Processing in Python"
-                        },
-                        {
-                           "url": "https://inventwithpython.com/bigbookpython/",
-                           "title": "The Big Book of Small Python Projects"
-                        },
-                        {
-                           "url": "http://www.spronck.net/pythonbook/",
-                           "title": "The Coder's Apprentice: Learning Programming with Python 3"
-                        },
-                        {
-                           "url": "https://jython.readthedocs.io/en/latest/",
-                           "title": "The Definitive Guide to Jython, Python for the Java Platform"
-                        },
-                        {
-                           "url": "http://docs.quantifiedcode.com/python-anti-patterns/",
-                           "title": "The Little Book of Python Anti-Patterns"
-                        },
-                        {
-                           "url": "http://niche-canada.org/research/niche-digital-infrastructure-project/the-programming-historian/",
-                           "title": "The Programming Historian"
-                        },
-                        {
-                           "url": "http://python-gtk-3-tutorial.readthedocs.org/en/latest/",
-                           "title": "The Python GTK+ 3 Tutorial"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20200626001242/http://effbot.org/librarybook/",
-                           "title": "The Standard Python Library"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/think-complexity-2e/",
-                           "title": "Think Complexity"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/think-dsp/",
-                           "title": "Think DSP - Digital Signal Processing in Python"
-                        },
-                        {
-                           "url": "https://greenteapress.com/wp/think-python-2e/",
-                           "title": "Think Python 2nd Edition"
-                        },
-                        {
-                           "url": "https://github.com/mattharrison/Tiny-Python-3.6-Notebook",
-                           "title": "Tiny Python 3.6 Notebook"
-                        },
-                        {
-                           "url": "http://web2py.com/book",
-                           "title": "Web2py: Complete Reference Manual, 6th Edition (pre-release)"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Django",
-                           "entries": [
-                              {
-                                 "url": "https://tutorial.djangogirls.org/en/",
-                                 "title": "Django Girls Tutorial"
-                              },
-                              {
-                                 "url": "https://media.readthedocs.org/pdf/django/1.5.x/django.pdf",
-                                 "title": "Django Official Documentation"
-                              },
-                              {
-                                 "url": "https://media.readthedocs.org/pdf/django/1.7.x/django.pdf",
-                                 "title": "Django Official Documentation"
-                              },
-                              {
-                                 "url": "https://media.readthedocs.org/pdf/django/1.9.x/django.pdf",
-                                 "title": "Django Official Documentation"
-                              },
-                              {
-                                 "url": "https://media.readthedocs.org/pdf/django/1.10.x/django.pdf",
-                                 "title": "Django Official Documentation"
-                              },
-                              {
-                                 "url": "https://buildmedia.readthedocs.org/media/pdf/django/2.2.x/django.pdf",
-                                 "title": "Django Official Documentation"
-                              },
-                              {
-                                 "url": "https://buildmedia.readthedocs.org/media/pdf/django/3.1.x/django.pdf",
-                                 "title": "Django Official Documentation"
-                              },
-                              {
-                                 "url": "https://www.packtpub.com/free-ebooks/django-restful-web-services",
-                                 "title": "Django RESTful Web Services"
-                              },
-                              {
-                                 "url": "https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django",
-                                 "title": "Django Web Framework (Python)"
-                              },
-                              {
-                                 "url": "http://agiliq.com/books/djenofdjango/",
-                                 "title": "Djen of Django"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20181130092020/http://www.effectivedjango.com/",
-                                 "title": "Effective Django"
-                              },
-                              {
-                                 "url": "http://www.tangowithdjango.com/book17/",
-                                 "title": "How to Tango With Django"
-                              },
-                              {
-                                 "url": "http://www.obeythetestinggoat.com/pages/book.html",
-                                 "title": "Test-Driven Development With Python And Django"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Flask",
-                           "entries": [
-                              {
-                                 "url": "https://exploreflask.com",
-                                 "title": "Explore Flask"
-                              },
-                              {
-                                 "url": "https://flask.palletsprojects.com",
-                                 "title": "Flask Documentation"
-                              },
-                              {
-                                 "url": "http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world",
-                                 "title": "The Flask Mega-Tutorial"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Kivy",
-                           "entries": [
-                              {
-                                 "url": "https://kivy.org/docs/guide-index.html",
-                                 "title": "Kivy Programming Guide"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Pandas",
-                           "entries": [
-                              {
-                                 "url": "https://bitbucket.org/hrojas/learn-pandas",
-                                 "title": "Learn Pandas"
-                              },
-                              {
-                                 "url": "https://pandas.pydata.org/docs",
-                                 "title": "pandas: powerful Python data analysis toolkit"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Pyramid",
-                           "entries": [
-                              {
-                                 "url": "http://docs.pylonsproject.org/projects/pyramid/en/latest/quick_tutorial/index.html#quick-tutorial",
-                                 "title": "Quick Tutorial for Pyramid"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Tornado",
-                           "entries": [
-                              {
-                                 "url": "https://bitbucket.org/hrojas/learn-web-programming",
-                                 "title": "Learn Web Programming"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "QML",
-                     "entries": [
-                        {
-                           "url": "http://qmlbook.github.io",
-                           "title": "Qt5 Cadaques"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "R",
-                     "entries": [
-                        {
-                           "url": "http://adv-r.had.co.nz",
-                           "title": "Advanced R Programming"
-                        },
-                        {
-                           "url": "http://www-bcf.usc.edu/~gareth/ISL/",
-                           "title": "An Introduction to Statistical Learning with Applications in R"
-                        },
-                        {
-                           "url": "http://www.cookbook-r.com",
-                           "title": "Cookbook for R"
-                        },
-                        {
-                           "url": "https://rafalab.github.io/dsbook/",
-                           "title": "Data Analysis and Prediction Algorithms with R"
-                        },
-                        {
-                           "url": "https://leanpub.com/dataanalysisforthelifesciences",
-                           "title": "Data Analysis for the Life Sciences"
-                        },
-                        {
-                           "url": "https://csgillespie.github.io/efficientR/",
-                           "title": "Efficient R programming"
-                        },
-                        {
-                           "url": "https://leanpub.com/exdata",
-                           "title": "Exploratory Data Analysis with R"
-                        },
-                        {
-                           "url": "https://dcl-prog.stanford.edu",
-                           "title": "Functional Programming"
-                        },
-                        {
-                           "url": "https://github.com/gjkerns/IPSUR",
-                           "title": "Introduction to Probability and Statistics Using R"
-                        },
-                        {
-                           "url": "https://learningstatisticswithr.com/book/",
-                           "title": "Learning Statistics with R"
-                        },
-                        {
-                           "url": "https://ismayc.github.io/moderndiver-book/",
-                           "title": "ModernDive"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/doc/contrib/Faraway-PRA.pdf",
-                           "title": "Practical Regression and Anova using R"
-                        },
-                        {
-                           "url": "http://r4ds.had.co.nz",
-                           "title": "R for Data Science"
-                        },
-                        {
-                           "url": "http://www.columbia.edu/~cjd11/charles_dimaggio/DIRE/resources/spatialEpiBook.pdf",
-                           "title": "R for Spatial Analysis"
-                        },
-                        {
-                           "url": "http://www.johndcook.com/blog/r_language_for_programmers",
-                           "title": "R Language for Programmers"
-                        },
-                        {
-                           "url": "https://goalkicker.com/RBook/",
-                           "title": "R Notes for Professionals"
-                        },
-                        {
-                           "url": "http://r-pkgs.had.co.nz",
-                           "title": "R Packages"
-                        },
-                        {
-                           "url": "http://www.columbia.edu/~cjd11/charles_dimaggio/DIRE/resources/R/practicalsBookNoAns.pdf",
-                           "title": "R Practicals"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/R_Programming",
-                           "title": "R Programming"
-                        },
-                        {
-                           "url": "https://leanpub.com/rprogramming",
-                           "title": "R Programming for Data Science"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/rsuccinctly",
-                           "title": "R Succinctly, Syncfusion"
-                        },
-                        {
-                           "url": "https://rcompanion.org/handbook/index.html",
-                           "title": "Summary and Analysis of Extension Program Evaluation in R"
-                        },
-                        {
-                           "url": "http://topepo.github.io/caret/index.html",
-                           "title": "The caret Package"
-                        },
-                        {
-                           "url": "http://www.burns-stat.com/pages/Tutor/R_inferno.pdf",
-                           "title": "The R Inferno"
-                        },
-                        {
-                           "url": "http://stat.ethz.ch/R-manual/R-patched/doc/html",
-                           "title": "The R Language"
-                        },
-                        {
-                           "url": "http://cran.r-project.org/manuals.html",
-                           "title": "The R Manuals"
-                        },
-                        {
-                           "url": "http://tidytextmining.com",
-                           "title": "Tidy Text Mining with R"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Racket",
-                     "entries": [
-                        {
-                           "url": "https://htdp.org/2019-02-24/",
-                           "title": "How to Design Programs"
-                        },
-                        {
-                           "url": "http://cs.brown.edu/courses/cs173/2012/book/index.html",
-                           "title": "Programming Languages: Application and Interpretation"
-                        },
-                        {
-                           "url": "http://docs.racket-lang.org/guide/index.html",
-                           "title": "The Racket Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Raku",
-                     "entries": [
-                        {
-                           "url": "https://kyclark.gitbooks.io/metagenomics",
-                           "title": "Metagenomics"
-                        },
-                        {
-                           "url": "https://andrewshitov.com/wp-content/uploads/2020/01/Perl-6-at-a-Glance.pdf",
-                           "title": "Perl 6 at a Glance"
-                        },
-                        {
-                           "url": "https://raku.guide",
-                           "title": "Raku Guide"
-                        },
-                        {
-                           "url": "https://andrewshitov.com/wp-content/uploads/2020/01/Raku-One-Liners.pdf",
-                           "title": "Raku One-Liners"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Raku_Programming",
-                           "title": "Raku Programming"
-                        },
-                        {
-                           "url": "https://github.com/LaurentRosenfeld/think_raku/raw/master/PDF/think_raku.pdf",
-                           "title": "Think Raku"
-                        },
-                        {
-                           "url": "https://github.com/perl6/book/",
-                           "title": "Using Perl 6"
-                        },
-                        {
-                           "url": "https://learnxinyminutes.com/docs/raku/",
-                           "title": "X=Raku"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Raspberry Pi",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/RPiMRE/read",
-                           "title": "Raspberry Pi: Measure, Record, Explore"
-                        },
-                        {
-                           "url": "http://www.cs.unca.edu/~bruce/Fall14/360/RPiUsersGuide.pdf",
-                           "title": "Raspberry Pi Users Guide - (2012)"
-                        },
-                        {
-                           "url": "https://www.raspberrypi.org/magpi-issues/Projects_Book_v1.pdf",
-                           "title": "The Official Raspberry Pi Project Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "REBOL",
-                     "entries": [
-                        {
-                           "url": "http://www.lulu.com/shop/nick-antonaccio/learn-rebol/ebook/product-17383182.html",
-                           "title": "Learn REBOL"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Ruby",
-                     "entries": [
-                        {
-                           "url": "https://github.com/bbatsov/ruby-style-guide",
-                           "title": "A community-driven Ruby style guide"
-                        },
-                        {
-                           "url": "https://www.codecademy.com/learn/ruby",
-                           "title": "CodeCademy Ruby"
-                        },
-                        {
-                           "url": "https://leanpub.com/developing-games-with-ruby/read",
-                           "title": "Developing Games With Ruby"
-                        },
-                        {
-                           "url": "https://i-love-ruby.gitlab.io",
-                           "title": "I Love Ruby"
-                        },
-                        {
-                           "url": "https://launchschool.com/books/ruby",
-                           "title": "Introduction to Programming with Ruby"
-                        },
-                        {
-                           "url": "http://jasonkim.ca/projects/just_enough_ruby_to_get_by/",
-                           "title": "Just Enough Ruby to Get By"
-                        },
-                        {
-                           "url": "https://essenceofchaos.gitbooks.io/learn-ruby-first/content/",
-                           "title": "Learn Ruby First"
-                        },
-                        {
-                           "url": "http://pine.fm/LearnToProgram/",
-                           "title": "Learn to Program"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20180321101922/http://www.humblelittlerubybook.com/book/html/index.html",
-                           "title": "Mr. Neighborly's Humble Little Ruby Book"
-                        },
-                        {
-                           "url": "https://launchschool.com/books/oo_ruby",
-                           "title": "Object Oriented Programming with Ruby"
-                        },
-                        {
-                           "url": "https://github.com/elm-city-craftworks/practicing-ruby-manuscripts",
-                           "title": "Practicing Ruby"
-                        },
-                        {
-                           "url": "http://ruby-doc.com/docs/ProgrammingRuby/",
-                           "title": "Programming Ruby"
-                        },
-                        {
-                           "url": "https://github.com/practicingruby/rbp-book/tree/gh-pages/pdfs",
-                           "title": "Ruby Best Practices"
-                        },
-                        {
-                           "url": "http://www.techotopia.com/index.php/Ruby_Essentials",
-                           "title": "Ruby Essentials"
-                        },
-                        {
-                           "url": "http://ruby-hacking-guide.github.io",
-                           "title": "Ruby Hacking Guide"
-                        },
-                        {
-                           "url": "https://www.ruby-lang.org/en/documentation/quickstart/",
-                           "title": "Ruby in Twenty Minutes"
-                        },
-                        {
-                           "url": "http://www.rubykoans.com",
-                           "title": "Ruby Koans"
-                        },
-                        {
-                           "url": "http://rubylearning.com",
-                           "title": "Ruby Learning"
-                        },
-                        {
-                           "url": "https://goalkicker.com/RubyBook/",
-                           "title": "Ruby Notes for Professionals"
-                        },
-                        {
-                           "url": "https://learnbyexample.github.io/learn_ruby_oneliners/",
-                           "title": "Ruby one-liners cookbook"
-                        },
-                        {
-                           "url": "http://www.linuxtopia.org/online_books/programming_books/ruby_tutorial/",
-                           "title": "Ruby Programming"
-                        },
-                        {
-                           "url": "https://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/index.html",
-                           "title": "Ruby User's Guide"
-                        },
-                        {
-                           "url": "https://leanpub.com/rwdtow/read",
-                           "title": "Ruby Web Dev: The Other Way"
-                        },
-                        {
-                           "url": "https://rubyfu.net",
-                           "title": "Rubyfu"
-                        },
-                        {
-                           "url": "http://ruby.bastardsbook.com",
-                           "title": "The Bastards Book of Ruby"
-                        },
-                        {
-                           "url": "http://www.sapphiresteel.com/ruby-programming/The-Book-Of-Ruby.html",
-                           "title": "The Book Of Ruby"
-                        },
-                        {
-                           "url": "https://www.rubyguides.com/ruby-tutorial/",
-                           "title": "The Definitive Ruby Tutorial For Complete Beginners"
-                        },
-                        {
-                           "url": "http://www.sapphiresteel.com/ruby-programming/The-Little-Book-Of-Ruby.html",
-                           "title": "The Little Book Of Ruby"
-                        },
-                        {
-                           "url": "https://rubyreferences.github.io/rubyref/",
-                           "title": "The Ruby Reference"
-                        },
-                        {
-                           "url": "http://www.caliban.org/ruby/rubyguide.shtml",
-                           "title": "The Unofficial Ruby Usage Guide (at Google)"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/programming/free/files/using-blocks-in-ruby.pdf",
-                           "title": "Using Blocks in Ruby"
-                        },
-                        {
-                           "url": "http://poignant.guide",
-                           "title": "Why's (Poignant) Guide to Ruby"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "RSpec",
-                           "entries": [
-                              {
-                                 "url": "http://betterspecs.org",
-                                 "title": "Better Specs (RSpec Guidelines with Ruby)"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Ruby on Rails",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/bbatsov/rails-style-guide",
-                                 "title": "A community-driven Rails style guide"
-                              },
-                              {
-                                 "url": "https://github.com/madeindjs/api_on_rails",
-                                 "title": "Api on Rails 6"
-                              },
-                              {
-                                 "url": "http://apionrails.icalialabs.com/book",
-                                 "title": "Building REST APIs with Rails"
-                              },
-                              {
-                                 "url": "https://leanpub.com/combinators/read",
-                                 "title": "Kestrels, Quirky Birds, and Hopeless Egocentricity"
-                              },
-                              {
-                                 "url": "http://www.thinkful.com/learn/ruby-on-rails-tutorial/",
-                                 "title": "Learn Ruby on Rails as You Modify a Craigslist Clone"
-                              },
-                              {
-                                 "url": "https://leanpub.com/learnrubyonrails",
-                                 "title": "Learn Ruby on Rails: Book One"
-                              },
-                              {
-                                 "url": "https://web.archive.org/web/20190319201525/http://objectsonrails.com/",
-                                 "title": "Objects on Rails"
-                              },
-                              {
-                                 "url": "http://guides.railsgirls.com",
-                                 "title": "Rails Girls Guides"
-                              },
-                              {
-                                 "url": "https://books.goalkicker.com/RubyBook/",
-                                 "title": "Ruby Notes for Professionals"
-                              },
-                              {
-                                 "url": "http://www.xyzpub.com/en/ruby-on-rails/3.2/",
-                                 "title": "Ruby on Rails 3.2 - Step by Step"
-                              },
-                              {
-                                 "url": "http://www.xyzpub.com/en/ruby-on-rails/4.0/",
-                                 "title": "Ruby on Rails 4.0 Guide"
-                              },
-                              {
-                                 "url": "http://guides.rubyonrails.org",
-                                 "title": "Ruby on Rails Guides"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/RubyOnRailsBook/",
-                                 "title": "Ruby on Rails Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://www.railstutorial.org/book",
-                                 "title": "Ruby on Rails Tutorial (Rails 5): Learn Web Development with Rails"
-                              },
-                              {
-                                 "url": "https://github.com/alindeman/upgradingtorails4",
-                                 "title": "Upgrading to Rails 4"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Sinatra",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/sinatra/sinatra-book",
-                                 "title": "Sinatra Book"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Rust",
-                     "entries": [
-                        {
-                           "url": "https://stevedonovan.github.io/rust-gentle-intro/",
-                           "title": "A Gentle Introduction To Rust"
-                        },
-                        {
-                           "url": "https://rust-unofficial.github.io/too-many-lists/",
-                           "title": "Learn Rust With Entirely Too Many Linked Lists"
-                        },
-                        {
-                           "url": "https://doc.rust-lang.org/stable/rust-by-example/",
-                           "title": "Rust by Example"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20190520171322/http://www.rustforrubyists.com/book/index.html",
-                           "title": "Rust for Rubyists"
-                        },
-                        {
-                           "url": "https://github.com/nrc/r4cppp",
-                           "title": "Rust For Systems Programmers"
-                        },
-                        {
-                           "url": "https://docs.rust-embedded.org/book/intro/index.html",
-                           "title": "The Embedded Rust Book"
-                        },
-                        {
-                           "url": "https://github.com/rust-lang/reference",
-                           "title": "The Rust Language Reference"
-                        },
-                        {
-                           "url": "http://doc.rust-lang.org/book/",
-                           "title": "The Rust Programming Language"
-                        },
-                        {
-                           "url": "https://doc.rust-lang.org/nomicon/",
-                           "title": "The Rustonomicon"
-                        },
-                        {
-                           "url": "https://www.oreilly.com/content/why-rust/",
-                           "title": "Why Rust?"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Sage",
-                     "entries": [
-                        {
-                           "url": "http://wstein.org/books/sagebook/sagebook.pdf",
-                           "title": "Sage for Power Users"
-                        },
-                        {
-                           "url": "http://www.sagemath.org/doc/",
-                           "title": "The Sage Manuals"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scala",
-                     "entries": [
-                        {
-                           "url": "https://docs.scala-lang.org/tutorials/scala-for-java-programmers.html",
-                           "title": "A Scala Tutorial for Java programmers"
-                        },
-                        {
-                           "url": "http://underscore.io/books/advanced-scala/",
-                           "title": "Advanced Scala with Cats"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20190629103826/http://naildrivin5.com/scalatour/",
-                           "title": "Another tour of Scala"
-                        },
-                        {
-                           "url": "http://underscore.io/books/creative-scala/",
-                           "title": "Creative Scala"
-                        },
-                        {
-                           "url": "https://github.com/alexanderfefelov/eai-patterns-with-actor-model",
-                           "title": "EAI Patterns with Actor Model"
-                        },
-                        {
-                           "url": "https://twitter.github.io/effectivescala/",
-                           "title": "Effective Scala"
-                        },
-                        {
-                           "url": "http://underscore.io/books/essential-scala/",
-                           "title": "Essential Scala"
-                        },
-                        {
-                           "url": "https://leanpub.com/fpmortals/read",
-                           "title": "Functional Programming for Mortals"
-                        },
-                        {
-                           "url": "https://alvinalexander.com/photos/functional-programming-simplied-free-pdf-preview",
-                           "title": "Functional Programming, Simplified (Scala edition)"
-                        },
-                        {
-                           "url": "https://alvinalexander.com/photos/hello-scala-free-pdf-preview",
-                           "title": "Hello, Scala"
-                        },
-                        {
-                           "url": "http://matt.might.net/articles/learning-scala-in-small-bites/",
-                           "title": "Learning Scala in small bites"
-                        },
-                        {
-                           "url": "http://eed3si9n.com/learning-scalaz/",
-                           "title": "Learning Scalaz"
-                        },
-                        {
-                           "url": "https://github.com/leithaus/XTrace/tree/monadic/src/main/book/content/",
-                           "title": "Pro Scala: Monadic Design Patterns for the Web"
-                        },
-                        {
-                           "url": "http://www.artima.com/pins1ed/",
-                           "title": "Programming in Scala, First Edition"
-                        },
-                        {
-                           "url": "https://leanpub.com/pfhais/read",
-                           "title": "Pure functional HTTP APIs in Scala"
-                        },
-                        {
-                           "url": "https://wrobstory.gitbooks.io/python-to-scala/content/",
-                           "title": "PythonToScala"
-                        },
-                        {
-                           "url": "http://aperiodic.net/phil/scala/s-99/",
-                           "title": "S-99: Ninety-Nine Scala Problems"
-                        },
-                        {
-                           "url": "http://www.scala-lang.org/old/sites/default/files/FrederikThesis.pdf",
-                           "title": "Scala & Design Patterns: Exploring Language Expressivity"
-                        },
-                        {
-                           "url": "https://www.scala-lang.org/old/sites/default/files/linuxsoft_archives/docu/files/ScalaByExample.pdf",
-                           "title": "Scala By Example"
-                        },
-                        {
-                           "url": "http://examples.oreilly.com/9781449339616-files/Scala_Cookbook_bonus_chapters.pdf",
-                           "title": "Scala Cookbook: Bonus Chapters"
-                        },
-                        {
-                           "url": "https://github.com/garu/scala-for-perl5-programmers",
-                           "title": "Scala for Perl 5 Programmers"
-                        },
-                        {
-                           "url": "http://twitter.github.io/scala_school/",
-                           "title": "Scala School by Twitter"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/scala_succinctly",
-                           "title": "Scala Succinctly"
-                        },
-                        {
-                           "url": "https://www.tutorialspoint.com/scala",
-                           "title": "Scala Tutorial"
-                        },
-                        {
-                           "url": "http://eed3si9n.com/tetrix-in-scala-html5-book",
-                           "title": "tetrix in Scala"
-                        },
-                        {
-                           "url": "http://danielwestheide.com/scala/neophytes.html",
-                           "title": "The Neophyte's Guide to Scala"
-                        },
-                        {
-                           "url": "http://underscore.io/books/shapeless-guide/",
-                           "title": "The Type Astronaut's Guide to Shapeless"
-                        },
-                        {
-                           "url": "https://github.com/leithaus/XTrace/tree/monadic/src/main/book/content/",
-                           "title": "Xtrace"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Lift",
-                           "entries": [
-                              {
-                                 "url": "http://exploring.liftweb.net",
-                                 "title": "Exploring Lift"
-                              },
-                              {
-                                 "url": "https://github.com/tjweir/liftbook",
-                                 "title": "Lift"
-                              },
-                              {
-                                 "url": "https://www.oreilly.com/library/view/lift-cookbook/9781449365042/",
-                                 "title": "Lift Cookbook"
-                              },
-                              {
-                                 "url": "http://simply.liftweb.net/Simply_Lift.pdf",
-                                 "title": "Simply Lift"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Play Scala",
-                           "entries": [
-                              {
-                                 "url": "http://underscore.io/books/essential-play/",
-                                 "title": "Essential Play"
-                              },
-                              {
-                                 "url": "http://alvinalexander.com/scala/scala-cookbook-play-framework-recipes-pdf-ebook",
-                                 "title": "Play Framework Recipes"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Scheme",
-                     "entries": [
-                        {
-                           "url": "https://panicz.github.io/pamphlet/",
-                           "title": "A Pamphlet Against R. Computational Intelligence in Guile Scheme"
-                        },
-                        {
-                           "url": "http://www.cs.rpi.edu/academics/courses/fall00/ai/scheme/reference/schintro-v14/schintro_toc.html",
-                           "title": "An Introduction to Scheme and its Implementation"
-                        },
-                        {
-                           "url": "https://gustavus.edu/+max/concrete-abstractions.html",
-                           "title": "Concrete Abstractions: An Introduction to Computer Science Using Scheme"
-                        },
-                        {
-                           "url": "http://www.cs.hut.fi/Studies/T-93.210/schemetutorial/",
-                           "title": "Scheme Tutorial"
-                        },
-                        {
-                           "url": "http://www.cs.berkeley.edu/~bh/ss-toc2.html",
-                           "title": "Simply Scheme: Introducing Computer Science"
-                        },
-                        {
-                           "url": "https://ds26gte.github.io/tyscheme/index-Z-H-1.html",
-                           "title": "Teach Yourself Scheme in Fixnum Days"
-                        },
-                        {
-                           "url": "http://www.scheme.com/tspl3/",
-                           "title": "The Scheme Programming Language: Edition 3"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours",
-                           "title": "Write Yourself a Scheme in 48 Hours"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scilab",
-                     "entries": [
-                        {
-                           "url": "http://forge.scilab.org/index.php/p/docintrotoscilab/downloads/",
-                           "title": "Introduction to Scilab"
-                        },
-                        {
-                           "url": "http://forge.scilab.org/index.php/p/docprogscilab/downloads/",
-                           "title": "Programming in Scilab"
-                        },
-                        {
-                           "url": "http://forge.scilab.org/index.php/p/docsciextensions/downloads/",
-                           "title": "Writing Scilab Extensions"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Scratch",
-                     "entries": [
-                        {
-                           "url": "http://scratched.gse.harvard.edu/guide/download.html",
-                           "title": "An Introductory Computing Curriculum Using Scratch"
-                        },
-                        {
-                           "url": "https://stwww1.weizmann.ac.il/scratch/scratch_en/",
-                           "title": "Computer Science Concepts in Scratch"
-                        },
-                        {
-                           "url": "https://www.raspberrypi.org/magpi-issues/Essentials_Scratch_v1.pdf",
-                           "title": "Learn to Code with Scratch"
-                        },
-                        {
-                           "url": "https://inventwithscratch.com/book/",
-                           "title": "Scratch Programming Playground"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Sed",
-                     "entries": [
-                        {
-                           "url": "https://learnbyexample.github.io/learn_gnused/",
-                           "title": "GNU sed"
-                        },
-                        {
-                           "url": "https://www.grymoire.com/Unix/Sed.html",
-                           "title": "Sed - An Introduction and Tutorial"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Self",
-                     "entries": [
-                        {
-                           "url": "http://handbook.selflanguage.org",
-                           "title": "The Self Handbook"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Smalltalk",
-                     "entries": [
-                        {
-                           "url": "http://books.pharo.org/deep-into-pharo/",
-                           "title": "Deep into Pharo"
-                        },
-                        {
-                           "url": "http://book.seaside.st/book/table-of-contents",
-                           "title": "Dynamic Web Development with Seaside"
-                        },
-                        {
-                           "url": "http://books.pharo.org/enterprise-pharo/",
-                           "title": "Enterprise Pharo: a Web Perspective"
-                        },
-                        {
-                           "url": "http://books.pharo.org/numerical-methods/",
-                           "title": "Numerical Methods with Pharo"
-                        },
-                        {
-                           "url": "http://books.pharo.org/pharo-by-example/",
-                           "title": "Pharo by Example"
-                        },
-                        {
-                           "url": "http://stephane.ducasse.free.fr/FreeBooks.html",
-                           "title": "Stef's Free Online Smalltalk Books"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Snap",
-                     "entries": [
-                        {
-                           "url": "https://snap.berkeley.edu/snapsource/help/SnapManual.pdf",
-                           "title": "Snap! Reference Manual"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Spark",
-                     "entries": [
-                        {
-                           "url": "https://www.gitbook.com/book/databricks/databricks-spark-knowledge-base/details",
-                           "title": "Databricks Spark Knowledge Base"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/databricks/databricks-spark-reference-applications/details",
-                           "title": "Databricks Spark Reference Applications"
-                        },
-                        {
-                           "url": "https://www.gitbook.com/book/jaceklaskowski/mastering-apache-spark/details",
-                           "title": "Mastering Apache Spark"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Splunk",
-                     "entries": [
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/splunk-7x-quick-start-guide",
-                           "title": "Splunk 7.x Quick Start Guide"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL (implementation agnostic)",
-                     "entries": [
-                        {
-                           "url": "https://www2.cs.arizona.edu/~rts/tdbbook.pdf",
-                           "title": "Developing Time-Oriented Database Applications in SQL"
-                        },
-                        {
-                           "url": "https://github.com/bobbyiliev/introduction-to-sql",
-                           "title": "Introduction to SQL"
-                        },
-                        {
-                           "url": "http://philip.greenspun.com/sql/",
-                           "title": "SQL For Web Nerds"
-                        },
-                        {
-                           "url": "http://goalkicker.com/SQLBook/",
-                           "title": "SQL Notes for Professionals"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/sql_queries_succinctly",
-                           "title": "SQL Queries Succinctly"
-                        },
-                        {
-                           "url": "http://use-the-index-luke.com",
-                           "title": "Use The Index, Luke!: A Guide To SQL Database Performance"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "SQL Server",
-                     "entries": [
-                        {
-                           "url": "http://www.red-gate.com/community/books/ssc-7",
-                           "title": "Best of SQLServerCentral.com Vol 7"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-maintenance-plans",
-                           "title": "Brad's Sure Guide to SQL Server Maintenance Plans"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/library/defensive-database-programming",
-                           "title": "Defensive Database Programming"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/library/fundamentals-of-sql-server-2012-replication",
-                           "title": "Fundamentals Of SQL Server 2012 Replication"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/exceptional-dba-book",
-                           "title": "How to Become an Exceptional DBA, Second edition"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/products/sql-development/sql-prompt/entrypage/sql-query-optimizer-ebook3",
-                           "title": "Inside the SQL Server Query Optimizer"
-                        },
-                        {
-                           "url": "http://social.technet.microsoft.com/wiki/contents/articles/11608.e-book-gallery-for-microsoft-technologies-en.aspx#IntroducingMicrosoftSQLServer2008R2",
-                           "title": "Introducing Microsoft SQL Server 2008 R2"
-                        },
-                        {
-                           "url": "http://social.technet.microsoft.com/wiki/contents/articles/11608.e-book-gallery-for-microsoft-technologies-en.aspx#IntroducingMicrosoftSQLServer2012",
-                           "title": "Introducing Microsoft SQL Server 2012"
-                        },
-                        {
-                           "url": "http://blogs.msdn.com/b/microsoft_press/archive/2014/04/02/free-ebook-introducing-microsoft-sql-server-2014.aspx",
-                           "title": "Introducing Microsoft SQL Server 2014"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/mastering-sql-server-profiler",
-                           "title": "Mastering SQL Server Profiler"
-                        },
-                        {
-                           "url": "http://goalkicker.com/MicrosoftSQLServerBook/",
-                           "title": "Microsoft SQL Server Notes for Professionals"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/dynamic-management-views",
-                           "title": "Performance Tuning with SQL Server Dynamic Management Views"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/protecting-data",
-                           "title": "Protecting SQL Server Data"
-                        },
-                        {
-                           "url": "http://social.technet.microsoft.com/wiki/contents/articles/11608.e-book-gallery-for-microsoft-technologies-en.aspx#SQLServer2012Tutorials%3AReportingServices",
-                           "title": "SQL Server 2012 Tutorials: Reporting Services"
-                        },
-                        {
-                           "url": "https://www.packtpub.com/free-ebooks/sql-server-2017-administrators-guide",
-                           "title": "SQL Server 2017 Administrator's Guide"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-backup-and-restore",
-                           "title": "SQL Server Backup and Restore"
-                        },
-                        {
-                           "url": "https://assets.red-gate.com/community/books/sql-server-execution-plans-3rd-edition.pdf",
-                           "title": "SQL Server Execution Plans, Third Edition"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/sql_server_for_c_sharp_developers_succinctly",
-                           "title": "SQL Server for C# Developers Succinctly"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-hardware",
-                           "title": "SQL Server Hardware"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/library/sql-server-internals-in-memory-oltp",
-                           "title": "SQL Server Internals: In-Memory OLTP"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/ebooks/sql-server-metadata-succinctly",
-                           "title": "SQL Server Metadata Succinctly"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/products/sql-development/sql-source-control/entrypage/sql-server-source-control-basics",
-                           "title": "SQL Server Source Control Basics"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-statistics",
-                           "title": "SQL Server Statistics"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-stumpers-v5",
-                           "title": "SQL Server Stumpers Vol.5"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-tacklebox",
-                           "title": "SQL Server Tacklebox"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/sql-server-transaction-log-management",
-                           "title": "SQL Server Transaction Log Management"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/art-of-filestream",
-                           "title": "The Art of SQL Server FILESTREAM"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/library/the-art-of-xsd",
-                           "title": "The Art of XSD"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/library/the-best-of-sqlservercentral-com-vol-7",
-                           "title": "The Best of SQLServerCentral.com Vol 7"
-                        },
-                        {
-                           "url": "https://www.red-gate.com/library/the-redgate-guide-to-sql-server-team-based-development",
-                           "title": "The Redgate Guide to SQL Server Team-based Development"
-                        },
-                        {
-                           "url": "http://www.red-gate.com/community/books/accidental-dba",
-                           "title": "Troubleshooting SQL Server: A Guide for the Accidental DBA"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Standard ML",
-                     "entries": [
-                        {
-                           "url": "http://www.pllab.riec.tohoku.ac.jp/smlsharp/smlIntroSlides.pdf",
-                           "title": "Introduction to Standard ML"
-                        },
-                        {
-                           "url": "https://www.cl.cam.ac.uk/~lp15/MLbook/pub-details.html",
-                           "title": "ML for the Working Programmer, 2nd Edition"
-                        },
-                        {
-                           "url": "http://homepages.inf.ed.ac.uk/stg/NOTES/",
-                           "title": "Programming in Standard ML '97"
-                        },
-                        {
-                           "url": "http://www.cs.cmu.edu/~rwh/isml/book.pdf",
-                           "title": "Programming in Standard ML, DRAFT"
-                        },
-                        {
-                           "url": "http://www.pllab.riec.tohoku.ac.jp/smlsharp/docs/3.0/en/manual.xhtml",
-                           "title": "SML# Document"
-                        },
-                        {
-                           "url": "http://sml-family.org/sml97-defn.pdf",
-                           "title": "The Definition of Standard ML (Revised)"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Subversion",
-                     "entries": [
-                        {
-                           "url": "http://ptgmedia.pearsoncmg.com/images/0131855182/downloads/Nagel_book.pdf",
-                           "title": "Subversion Version Control"
-                        },
-                        {
-                           "url": "http://svnbook.red-bean.com",
-                           "title": "Version Control with Subversion"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Swift",
-                     "entries": [
-                        {
-                           "url": "https://essential-swift.programming-books.io",
-                           "title": "Essential Swift"
-                        },
-                        {
-                           "url": "https://www.hackingwithswift.com",
-                           "title": "Hacking with Swift"
-                        },
-                        {
-                           "url": "https://goalkicker.com/SwiftBook/",
-                           "title": "Swift Notes for Professionals"
-                        },
-                        {
-                           "url": "https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/index.html",
-                           "title": "The Swift Programming Language"
-                        },
-                        {
-                           "url": "https://developer.apple.com/library/content//documentation/Swift/Conceptual/BuildingCocoaApps/index.html",
-                           "title": "Using Swift with Cocoa and Objective-C"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Vapor",
-                           "entries": [
-                              {
-                                 "url": "https://theswiftdev.com/2018/04/09/vapor-3-tutorial-for-beginners",
-                                 "title": "Vapor 3 Tutorial For Beginners"
-                              },
-                              {
-                                 "url": "https://docs.vapor.codes",
-                                 "title": "Vapor Official Docs"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Tcl",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Programming%3ATcl",
-                           "title": "Tcl Programming"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TEI",
-                     "entries": [
-                        {
-                           "url": "https://books.openedition.org/oep/426",
-                           "title": "What is the Text Encoding Initiative?"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Teradata",
-                     "entries": [
-                        {
-                           "url": "http://www.info.teradata.com",
-                           "title": "Teradata Books"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Tizen",
-                     "entries": [
-                        {
-                           "url": "https://developer.tizen.org/sites/default/files/documentation/guide_to_developing_tizen_native_application_en_2.pdf",
-                           "title": "Guide to Developing Tizen Native Application"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TLA",
-                     "entries": [
-                        {
-                           "url": "http://research.microsoft.com/en-us/um/people/lamport/tla/book.html",
-                           "title": "Specifying Systems: The TLA+ Language and Tools for Hardware and Software Engineers"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "TypeScript",
-                     "entries": [
-                        {
-                           "url": "https://learnxinyminutes.com/docs/typescript/",
-                           "title": "Learn TypeScript in Y Minutes"
-                        },
-                        {
-                           "url": "https://accelerated.amimetic.co.uk",
-                           "title": "TypeScript Accelerated"
-                        },
-                        {
-                           "url": "https://basarat.gitbooks.io/typescript/",
-                           "title": "TypeScript Deep Dive"
-                        },
-                        {
-                           "url": "http://www.infoq.com/minibooks/typescript-c-sharp-programmers",
-                           "title": "TypeScript for C# Programmers"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/typescript",
-                           "title": "TypeScript Succinctly, Syncfusion"
-                        }
-                     ],
-                     "subsections": [
-                        {
-                           "section": "Angular",
-                           "entries": [
-                              {
-                                 "url": "https://github.com/johnpapa/angular-styleguide/blob/master/a2/README.md",
-                                 "title": "Angular 2 Style Guide"
-                              },
-                              {
-                                 "url": "https://goalkicker.com/Angular2Book/",
-                                 "title": "Angular 2+ Notes for Professionals"
-                              },
-                              {
-                                 "url": "https://angular.io/docs",
-                                 "title": "Angular Docs"
-                              },
-                              {
-                                 "url": "https://material.angular.io/guide",
-                                 "title": "Angular Material"
-                              },
-                              {
-                                 "url": "https://angular.io/tutorial",
-                                 "title": "Angular Tutorial"
-                              },
-                              {
-                                 "url": "https://www.c-sharpcorner.com/ebooks/build-a-full-stack-web-application-using-angular-and-firebase",
-                                 "title": "Build a Full-Stack Web Application Using Angular & Firebase"
-                              }
-                           ]
-                        },
-                        {
-                           "section": "Deno",
-                           "entries": [
-                              {
-                                 "url": "https://deno.land/manual",
-                                 "title": "Deno Manual"
-                              },
-                              {
-                                 "url": "https://flaviocopes.com/deno",
-                                 "title": "FlavioCopes Deno Handbook"
-                              }
-                           ]
-                        }
-                     ]
-                  },
-                  {
-                     "section": "Unix",
-                     "entries": [
-                        {
-                           "url": "http://www.oliverelliott.org/article/computing/tut_unix/",
-                           "title": "An Introduction to Unix"
-                        },
-                        {
-                           "url": "http://beej.us/guide/bgipc/",
-                           "title": "Beej's Guide to Unix Interprocess Communication"
-                        },
-                        {
-                           "url": "http://www.lemis.com/grog/Documentation/Lions/",
-                           "title": "Commentary on the Sixth Edition UNIX Operating System"
-                        },
-                        {
-                           "url": "https://homepages.uc.edu/~thomam/Intro_Unix_Text/TOC.html",
-                           "title": "INTRODUCTION TO UNIX"
-                        },
-                        {
-                           "url": "https://github.com/mrzool/unix-as-ide",
-                           "title": "Unix as IDE"
-                        },
-                        {
-                           "url": "http://www.cs.bu.edu/teaching/unix/reference/",
-                           "title": "UNIX Commands and Concepts"
-                        },
-                        {
-                           "url": "http://web.stanford.edu/class/cs124/kwc-unix-for-poets.pdf",
-                           "title": "Unix for Poets"
-                        },
-                        {
-                           "url": "http://cb.vu/unixtoolbox.xhtml",
-                           "title": "Unix Toolbox"
-                        },
-                        {
-                           "url": "http://www.ee.surrey.ac.uk/Teaching/Unix/",
-                           "title": "UNIX Tutorial for Beginners"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Verilog",
-                     "entries": [
-                        {
-                           "url": "https://zipcpu.com/tutorial/",
-                           "title": "Verilog, Formal Verification and Verilator Beginner's Tutorial"
-                        },
-                        {
-                           "url": "http://sutherland-hdl.com/pdfs/verilog_2001_ref_guide.pdf",
-                           "title": "Verilog Quick Reference Guide - Sutherland HDL"
-                        },
-                        {
-                           "url": "http://www.asic-world.com/verilog/veritut.html",
-                           "title": "Verilog Tutorial"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "VHDL",
-                     "entries": [
-                        {
-                           "url": "https://github.com/fabriziotappero/Free-Range-VHDL-book",
-                           "title": "Free Range VHDL"
-                        },
-                        {
-                           "url": "http://www.seas.upenn.edu/~ese171/vhdl/vhdl_primer.html",
-                           "title": "VHDL Tutorial"
-                        },
-                        {
-                           "url": "http://esd.cs.ucr.edu/labs/tutorial/",
-                           "title": "VHDL Tutorial: Learn By Example"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Vim",
-                     "entries": [
-                        {
-                           "url": "http://www.swaroopch.com/notes/vim/",
-                           "title": "A Byte of Vim"
-                        },
-                        {
-                           "url": "https://github.com/iggredible/Learn-Vim",
-                           "title": "Learn Vim (the Smart Way)"
-                        },
-                        {
-                           "url": "http://yannesposito.com/Scratch/en/blog/Learn-Vim-Progressively/",
-                           "title": "Learn Vim Progressively"
-                        },
-                        {
-                           "url": "http://learnvimscriptthehardway.stevelosh.com",
-                           "title": "Learn Vimscript the Hard Way"
-                        },
-                        {
-                           "url": "https://leanpub.com/VimLikeAPro",
-                           "title": "Use Vim Like A Pro"
-                        },
-                        {
-                           "url": "http://www.truth.sk/vim/vimbook-OPL.pdf",
-                           "title": "Vi Improved -- Vim"
-                        },
-                        {
-                           "url": "https://github.com/mhinz/vim-galore#readme",
-                           "title": "VIM-GALORE - All things Vim!"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20130302172911/http://vim.runpaint.org/vim-recipes.pdf",
-                           "title": "Vim Recipes"
-                        },
-                        {
-                           "url": "http://vimregex.com",
-                           "title": "Vim Regular Expressions 101"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Visual Basic",
-                     "entries": [
-                        {
-                           "url": "https://goalkicker.com/VisualBasic_NETBook/",
-                           "title": "Visual Basic .NET Notes for Professionals"
-                        },
-                        {
-                           "url": "http://www.techotopia.com/index.php/Visual_Basic_Essentials",
-                           "title": "Visual Basic Essentials"
-                        },
-                        {
-                           "url": "https://docs.microsoft.com/en-us/dotnet/visual-basic",
-                           "title": "Visual Basic Official Docs"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Visual Prolog",
-                     "entries": [
-                        {
-                           "url": "http://wiki.visual-prolog.com/index.php?title=A_Beginners_Guide_to_Visual_Prolog",
-                           "title": "A Beginners' Guide to Visual Prolog"
-                        },
-                        {
-                           "url": "http://wiki.visual-prolog.com/index.php?title=Visual_Prolog_for_Tyros",
-                           "title": "Visual Prolog for Tyros"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Web Services",
-                     "entries": [
-                        {
-                           "url": "http://restfulwebapis.org/RESTful_Web_Services.pdf",
-                           "title": "RESTful Web Services"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Windows 8",
-                     "entries": [
-                        {
-                           "url": "https://web.archive.org/web/20150624142410/http://download.microsoft.com/download/6/6/5/665AF7A6-2184-45DC-B9DA-C89185B01937/Microsoft_Press_eBook_Programming_Windows_8_Apps_HTML_CSS_JavaScript_2E_PDF.pdf",
-                           "title": "Programming Windows Store Apps with HTML, CSS, and JavaScript, Second Edition"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Windows Phone",
-                     "entries": [
-                        {
-                           "url": "http://coolthingoftheday.blogspot.co.uk/2012/05/free-ebook-guidance-advanced-windows.html",
-                           "title": "Developing An Advanced Windows Phone 7.5 App That Connects To The Cloud"
-                        },
-                        {
-                           "url": "https://www.syncfusion.com/resources/techportal/ebooks/windowsphone8",
-                           "title": "Windows Phone 8 Development Succinctly"
-                        },
-                        {
-                           "url": "http://channel9.msdn.com/Series/Windows-Phone-8-1-Development-for-Absolute-Beginners",
-                           "title": "Windows Phone 8.1 Development for Absolute Beginners"
-                        },
-                        {
-                           "url": "http://www.robmiles.com/c-yellow-book/",
-                           "title": "Windows Phone Programming Blue Book"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "Workflow",
-                     "entries": [
-                        {
-                           "url": "https://leanpub.com/declarepeaceonvms/read",
-                           "title": "Declare Peace on Virtual Machines. A guide to simplifying vm-based development on a Mac"
-                        }
-                     ],
-                     "subsections": []
-                  },
-                  {
-                     "section": "xBase (dBase / Clipper / Harbour)",
-                     "entries": [
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Application_Development_with_Harbour",
-                           "title": "Application Development with Harbour"
-                        },
-                        {
-                           "url": "https://web.archive.org/web/20190516192814/http://www.ousob.com/ng/clguide/",
-                           "title": "CA-Clipper 5.2 Norton Guide"
-                        },
-                        {
-                           "url": "https://en.wikibooks.org/wiki/Clipper_Tutorial%3A_a_Guide_to_Open_Source_Clipper(s)",
-                           "title": "Clipper Tutorial: a Guide to Open Source Clipper(s)"
-                        }
-                     ],
-                     "subsections": []
-                  }
-               ]
-            }
-         ]
-      }
-   ]
-}
\ No newline at end of file