title: Context free grammar conversion
body: <p>can anyone let me know if there is any software to convert <a href="http://en.wikipedia.org/wiki/Chomsky_normal_form" rel="nofollow noreferrer">Chomsky normal form</a> to <a href="http://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form" rel="nofollow noreferrer">Backus–Naur Form</a> and vice versa?</p>