（1）｛5｝｛10｝｛5.10｝Φ
㈡｛1｝｛2｝｛3｝｛4｝｛1.2｝｛1.3｝｛1.4｝｛2.3｝｛2.4｝｛3.4｝｛1.2.3｝｛1.2.4｝｛1.3.4｝｛2.3.4｝｛1234｝Φ
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これを見れば授業なしでも集合が分かる！
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