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15. Give a simple a simple description of the language generated by the grammar with productions. S aaA A bS S 17. Let = {a,b}.

15. Give a simple a simple description of the language generated by the grammar with productions.

S aaA

A bS

17. Let = {a,b}. Find a grammar that generates L = {a^(n+3)b^n: n >= 2}.

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