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4. (Non-CFLs) Prove that the following languages are not context-free. (a) A = {0 m 1 n 0 m 1 n | m, n 0}.

4. (Non-CFLs) Prove that the following languages are not context-free.

(a) A = {0^m1ⁿ0^m1ⁿ | m, n 0}.

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