20/07/27 15:12:55.97 dppBRBhf.net
>>40 文字化け訂正
If B is a subset of A, then A is a superset of B, written A superset= B.
If A is a proper superset of B, this is written A superset B.
↓
If B is a subset of A, then A is a superset of B, written A ⊇ B.
If A is a proper superset of B, this is written A ⊃ B.