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why Cqpq is not correct sentence ? its correct by rule number three.

Posted by hasan83 at 2006-05-06 02:57:46 on Problem 1126

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there are no two correct sentences s and t such that st = qpq (0) frkstyc 2006-05-06 08:46:00
1.Every character from p through z is a correct sentence. (33) kevinew 2006-10-31 15:53:57

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