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[class collections.Counter([iterable-or-mapping])](https://docs.python.org/ja/3/library/collections.html#collections.Counter)です。
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例
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```python
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>>> from collections import Counter
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>>> print(Counter(["数学", "音楽", "美術", "体育", "数学", "美術", "数学"]))
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Counter({'数学': 3, '美術': 2, '音楽': 1, '体育': 1})
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```
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