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6. Find grammars for Σ= {a,b} that generate the sets of (you can combine the production rules using the "" notation) (a)
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6. Find grammars for Σ= {a,b} that generate the sets of (you can combine the production rules using the "" notation) (a)
6. Find grammars for Σ= {a,b} that generate the sets of (you can combine the production rules using the "" notation) (a) [15 points] all strings with at least two a 's. (b) [15 points] all strings with no more than three a 's.