For each of the following strings give a valid derivation, and a parse tree, for that string.

computer science

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Question 1. For each of the following strings give a valid derivation, and a parse tree, for that string.


Question 2. Is the grammar unambiguous? Justify your answer. 


Question 3 Applying this new pumping lemma can require the same sort of creative decisions as the one for regular languages. Previously we showed this language was not regular:


Question 4 We mentioned earlier that the class of context-free languages is not closed under the intersection operation.


Can you prove it now that we have some examples of non-context-free languages?

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