Update README.md
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Linux Penetration Testing OS
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* [BackBox](https://backbox.org/index)
* [BlackArch](https://blackarch.org/index.html)
* [Kali](http://kali.org/)
* [LionSec Linux](https://lionsec-linux.org/)
* [Parrot ](https://www.parrotsec.org/)
Exploits
The note is not visible to the blocked user.