Groups of Special-Equivalent Strings: coding question

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Count the number of equivalence classes of strings under the relation that allows arbitrary swaps among even indices and among odd indices. Key idea: each string's invariant is the multiset (or sorted sequence) of its even-indexed characters and of its odd-indexed characters — strings with the same pair form are special-equivalent.

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Leetcode 893. Groups of Special-Equivalent Strings
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Groups of Special-Equivalent Strings

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Groups of Special-Equivalent Strings

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