Like Set Tools in 'Base' Package but Keeps Duplicate Elements

Documentation for package ‘vecsets’ version 1.4

vecsets-package	An extension of the 'base' tools such as 'intersect' which does not reduce to unique elements
vecsets	An extension of the 'base' tools such as 'intersect' which does not reduce to unique elements
vintersect	Perform intersection of two vectors, including counting repeated elements.
vperm	Calculate all permutations of all combinations of a specified size from a data object.
vsetdiff	Find all elements in first argument which are not in second argument.
vsetequal	Check whether two vectors contain exactly the same collection of elements.
vunion	Returns the union of its inputs including repeated elements.