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13. (8%)(a) Give a regular expression defining the same language as the following context-free grammar: S Sa, K-a, S Kb. KKa. (b) What is the

13. (8%)(a) Give a regular expression defining the same language as the following context-free grammar: S Sa, K-a, S Kb. KKa. (b) What is the language over the alphabet {a,b} defined by the following context-free gram- mar with start variable S: SaSa, ST, TT, T

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