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Give unambiguous CFGs for the following languages. a. {w in every prefix of w the number of a's is at least the number of bs)

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Give unambiguous CFGs for the following languages. a. {w in every prefix of w the number of a's is at least the number of bs) b. {w the number of a's and the number of b's in w are equal) c. (w the number of a's is at least the number of b's in w

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