[https://leetcode.com/problems/permutation-in-string/description/](https://leetcode.com/problems/permutation-in-string/description/) Given two strings s1 and s2 ...
# Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. # In other words, return true if one of s1's permutations is the substring of s2.
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