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Let G = ({S, X, Y, Z}, {a,b}, S, {S XYZ, X SYZ, Y SXZ, X a, Yb, Za}) be a context-free grammar. Prove


  

Let G = ({S, X, Y, Z}, {a,b}, S, {S XYZ, X SYZ, Y SXZ, X a, Yb, Za}) be a context-free grammar. Prove that if x E L(G), the length of x has the form 3+2k, where k 0.

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