Check Whether Two Strings are Almost Equivalent LeetCode solution in Python

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from collections import Counter
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class Solution:
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    def checkAlmostEquivalent(self, w1: str, w2: str) -> bool:
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        return all(
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            v < 4
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            for v in (
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                (Counter(w1) - Counter(w2)) + (Counter(w2) - Counter(w1))
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            ).values()
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        )