Question

This question was created from 662_hw#2_Sol.pdf https://www.coursehero.com/file/31511712/662-hw2-Solpdf/

The question is to find grammars for ∑={a,b} that generate the set of: a) All strings with exactly one a. b) All strings with no more than three a's. And the solutions do make sense but can you give me convincing arguments that the grammar this gives indeed generate the indicated language to explain my how they work?

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