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Define properly neeted parenthesis structures involving two kinds of parentheses, and remove all unit productions, useless productions and lambda productions 4. Remove all unit-productions, useless

Define properly neeted parenthesis structures involving two kinds of parentheses, and remove all unit productions, useless productions and lambda productions

4. Remove all unit-productions, useless productions, and all -productions: SaAaBBAaaABbBbbCCB

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