[數撚圍爐區] There are three kinds of people in the world. (10)

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2019-03-18 15:45:35
2019-03-18 15:47:51
[member]我諗緊係咪類似 x<X=x係empty set
但係 x=X<=x 就有嘢
Btw 1999[/member］
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