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Suppose that we have an operation called perm which takes a word and produces all the permutations of that word. Given a language L we define perm(L) to be the language obtained by taking all the permutations of all the words of L. Show that if L is regular then perm(L) may not even be context-free. [Hint: You will need an alphabet with at least 3 letters.]

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Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M9118518

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