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A form of set that permits multiple instances of the same value to be maintained in the collection.
a collection of elements in which elements can have duplicate values
a generalisation of a set, in which elements occur with multiplicities which may be greater than one
a kind of associative container that supports equal keys (possibly contains multiple copies of the same key value) and provides for fast retrieval of the keys themselves
an unordered collection of values
a set for which repeated elements are considered
a set with (possibly) repeated elements
In mathematics, a multiset (sometimes also called a bag) differs from a set in that each member has a multiplicity, which is a natural number indicating (loosely speaking) how many times it is a member, or perhaps how many memberships it has in the multiset. For example, in the multiset { a, a, b, b, b, c }, the multiplicities of the members a, b, and c are respectively 2, 3, and 1.
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