Count Common Words With One Occurrence LeetCode solution in Python

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class Solution:
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    def countWords(self, words1: List[str], words2: List[str]) -> int:
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        count = Counter(words1 + words2)
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        return len(
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            [
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                word
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                for word in count
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                if count[word] == 2 and word in words1 and word in words2
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            ]
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        )