Group words into anagram lists

Q: Group words into anagram lists

This question evaluates string manipulation, data-structure design, and algorithmic complexity analysis, including considerations for case sensitivity, non-ASCII characters, and handling very long strings.

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Question

Given an array of strings, group the words into lists of anagrams and return the collection of groups in any order. For example, ["abc", "cab", "edf"] -> [["abc", "cab"], ["edf"]]. Aim for near-linear time in the total number of characters. Specify how you handle case sensitivity, non-ASCII characters, and very long strings, and choose an approach that avoids sorting each string if possible.

Group words into anagram lists

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