回答編集履歴
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コード間違い修正
answer
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@@ -2,7 +2,7 @@
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[https://docs.python.org/ja/3.6/library/itertools.html#itertools-recipes](https://docs.python.org/ja/3.6/library/itertools.html#itertools-recipes)
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```Python
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import
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import collections
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from itertools import islice
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