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4 15pt) Use induction to prove that for any string w that belongs to the following language L, na (w) = nb(w), where nr(u) is

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4 15pt) Use induction to prove that for any string w that belongs to the following language L, na (w) = nb(w), where nr(u) is the number of occurrences of r in u. L is generated by the following grammar

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