Question: Prove that following CFG is ambiguous. string --> string + string | string - string | 0 | 1 | 2 | 3 | 4

Prove that following CFG is ambiguous. string --> string + string | string - string | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

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