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Raphael earned this badge 5 times
apr 9 at 5:31
How to prove that a language is not context-free?
jan 31 at 14:54
How to convert finite automata to regular expressions?
jan 17 at 23:16
How to prove that a language is not regular?
aug 8 at 6:38
How can it be decidable whether $\pi$ has some sequence of digits?
may 18 '12 at 2:31
How not to solve P=NP?

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