Question: Let sigma = (a, b, C, D), S = {ba, DC}. Find the number of words of length 14 in S * 4. For each

Let sigma = (a, b, C, D), S = {ba, DC}. Find the number of words of length 14 in S * 4. For each of the languages sigma = {a, b}, find a regular expression representing it: All strings that begin with aba and end with bb. All strings that contain at least two a's

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