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Give regular expressions for the following languages on sigma = {a, b} a) L_2 = {w: w ends in aa}. b) L_3 = {w: w

Give regular expressions for the following languages on sigma = {a, b} a) L_2 = {w: w ends in aa}. b) L_3 = {w: w does not end in aa}. c) L_4 = {w: |w| mod 3 = 0}. d) L_5 = all strings containing no more than three a's

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