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( 5 points ) Section 1 . 2 Question 1 4 ( Grammars ) : Find grammars for = { a , b } that

(5 points) Section 1.2 Question 14(Grammars):
Find grammars for ={a,b} that generate the sets of
(a)** all strings with exactly two a's.
(b) all strings with at least two a's.
(c) all strings with no more than three a's.

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