Given a string s and an array of equal-length words, find all starting indices of substrings in s that are a concatenation of each word exactly once in any order. The core challenge is matching a multiset of fixed-length tokens efficiently (typically with a sliding-window and frequency map) over s.
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Substring with Concatenation of All Words - You are given a string s and an array of strings words of the same length. Return all starting indices of substring(s) in s that is a concatenation of each word in words exactly once, in any order, and without any intervening characters.
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