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5) (3pts) Give an example of when an attribute grammar is needed. 6) (3pts) Why is it important for a grammar to be unambiguous? 7)

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5) (3pts) Give an example of when an attribute grammar is needed. 6) (3pts) Why is it important for a grammar to be unambiguous? 7) (3pts) Show that the following grammar is ambiguous - show two distinct parse trees for one terminal string. +()abc

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