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a) Draw NFAs for the following regular expressions (in all of the problems, 2 = {a, b}: nel (a U bt)a+b+ il at u (ab)+

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a) Draw NFAs for the following regular expressions (in all of the problems, 2 = {a, b}: nel (a U bt)a+b+ il at u (ab)+ 6) Why can't we prove "the class of regular languages is closed under the concatenation operation using DFAs? How does non-determinism help us in proving this theorem

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