vecsets-package         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.
