As the comment in my code explains, the task is to find the number of pairs of strings from a given input file which are permutations of each other. For example, "ABCD" and "BCDA" are permutations of each other, meaning that a pair has been found. As the comment in my code explains, the task is
阅读背景：
使用hashCode和Arrays.equals时可能存在散列问题
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