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*Problem 8.12(d). A set P of parenthesis strings has a recursive definition (right). (1) (2) x = P [x] = P , (d) Prove

*Problem 8.12(d). A set P of parenthesis strings has a recursive definition (right). (1) (2) x = P [x] = P , (d) Prove by structural induction that every string in P is balanced.

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