Question: 4. Let = {a, b} (a) Build an FA that accepts only those words in that have an even number of substrings ba . (b)

4. Let 4. Let = {a, b} (a) Build an FA that accepts only = {a, b} (a) Build an FA that accepts only those words in those words in that have an even number of substrings ba. (b) that have an even number of substrings ba. (b) Build an FA that accepts all words in with at least two a's and at least two b's.

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