1) Basic concept in set theory
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https://www.crosswordclues.com/clue/multiset
In mathematics, the notion of multiset (or bag) is a generalization of the notion of a set in which members are allowed to appear more than once. For example, there is a unique set that contains the elements a and b and no others, but there are many multisets with this property, such as the multiset that contains two copies of a and one of b or th...
Found on
http://en.wikipedia.org/wiki/Multiset
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