多重集：一个数学上的概念，表示了一种从集合中元素到出现次数只见的映射关系。
A mathematical entity that represents a mapping between the elements of a set and the number of times they appear.
多重集：一个数学上的概念，表示了一种从集合中元素到出现次数只见的映射关系。
A mathematical entity that represents a mapping between the elements of a set and the number of times they appear.
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