2.Back to how much, depends on their sets.
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depends on their sets
取决于它们的集合
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The order of tuples in the resulting set depends on the order of the sets to be joined and the order of their members.
所得集中元组的顺序取决于要联接的集的顺序以及其成员的顺序。
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