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Grammar G: A A + A | A A | 1 | 2 1. Prove that the grammar G above is ambiguous by

Grammar G: A → A + A | A − A | 1 | 2

1. Prove that the grammar G above is ambiguous by giving two leftmost derivations of the string 2 - 2 + 1

2. Give an unambiguous grammar for G by making a new grammar for the same language that is not ambiguous.

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