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9. Consider the context-free grammar G with start symbol S and productions SAB | aBA BAA | , AaS | bAAA, B aABB | BAB

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9. Consider the context-free grammar G with start symbol S and productions SAB | aBA BAA | , AaS | bAAA, B aABB | BAB | aBBA BS. Prove that L(G) is the language consisting of all words that have exactly twice as many as a's as b's

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