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6. (20 pt) Show that the following languages are not regular. (a) L = {ab i = 2;}. (b) L = {w {a,b,c}* | w

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6. (20 pt) Show that the following languages are not regular. (a) L = {ab i = 2;}. (b) L = {w {a,b,c}* | w is a palindrome (i.e. w=w = wf)}

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