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Answers for “在关系图中，两个集合之间的箭头意味着什么？”

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The example defines a set of humans and a set of pets. The Cartesian product contains all possible human-pet pairings.

Conditions: The sets are humans { $h_1$ , $h_2$ , $h_3$ , $h_4$ } and pets { $d_1$ , $c_1$ , $d_2$ , $m_1$ }.; The relation is ownership.