the TypeScript style iterator
true if this MultiSet did not already contain the specified element
true if this MultiSet contains the specified element
the number of occurrences of the element in this MultiSet; possibly zero but never negative
true if this MultiSet contains no elements
the Java style iterator
a view of the set of distinct keys in this MultiSet
true if the set contained the specified element
the number of elements in this MultiSet (its cardinality)
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