Description: Enter a positive integer n is less than 10, according to the exchange of each element to the top of the first method, and output the first n lowercase letters all the permutations.
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qiongjusuoyouquanpailie\qiongjusuoyouquanpailie.docx
.......................\穷举所有排列\Debug\vc60.idb
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qiongjusuoyouquanpailie