Question: 4. Consider a grammar with alphabet a, b and c. a. Give a regular expression to generate all strings with only one a. b.

4. Consider a grammar with alphabet a, b and c. a. Give a regular expression to generate all strings with only one a. b. Give a regular expression to generate all strings with exactly two as. 5. What is an ambiguous grammar? 6. What is denotational semantics? What are its strengths and weaknesses as compared to other approaches to semantics. What is axiomatic semantics? What are its strengths and weaknesses as compared to other approaches to semantics.

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