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Show that the following languages are context-free by exhibiting context free grammars generating each. (a) {ab: m-n) (c) wE a, b}*: w has twice as

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Show that the following languages are context-free by exhibiting context free grammars generating each. (a) {a"b": m-n) (c) wE a, b}*: w has twice as many b's as a's) (d) {uaub : u, w E {a, b)", lul = luh (f) fa"b" : m

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