为了对任何一组数字进行分类，此处有一种算法可使它们按顺序排列。

Here's an algorithm for sorting any set of Numbers, to get them into order.

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写一个计算一个字符串所有排列的算法。

Write a method to compute all permutations of a string.

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写一个计算一个字符串所有排列的算法。

Write a method to compute all permutations of a string.

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