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2. Give regular expressions for each of the following languages with alphabet {a, b) 3a. ^w : w contains exactly two b's 3b. (w :

2. Give regular expressions for each of the following languages with alphabet {a, b) 3a. ^w : w contains exactly two b's 3b. (w : w has length at least 4 and the 2nd and 2nd-to-last symbols match) 3c. (w : w does not contain the substring ab) 3d. {w : w does not contain the substring aa

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