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7. [ 8 points] Given the Context Free Grammar G={{S},{a,b,+,x},P,S} where P consists of the following productions: SS+SSSab Prove whether or not the string given

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7. [ 8 points] Given the Context Free Grammar G={{S},{a,b,+,x},P,S} where P consists of the following productions: SS+SSSab Prove whether or not the string given by a+axb is ambiguous

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