(1) For each of the following languages, say whether it is context-free. If so, write a CFG or draw a PDA (non-mathematically) that generates the language. If not, prove it using the pumping lemma and/or closure properties for CFLS. (a) (b) (c) (d) L = {a" | n > 0}. L = {amb"cm-") | m > n} L = {amb"cmn m, n > 0} L = {a"b" cm m > n}

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