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3 . Let Sigma = { a , b } and A = { w | baab is a substring of w and abba
Let Sigma a b and A w baab is a substring of w and abba is not a substring of w
Is A a regular language? Justify your answer. You will probably need a proof by contradiction with the pumping lemma. But keep in mind that the lemma states there exists a split for all strings, so you cannot just choose string and then show split and how the pumping updown does not work need to show all cases for whichever string
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