getall                  Get all permutations/combinations for a
                        iterator
getcurrent              Get the current element of a iterator
getlength               Get the length for a iterator
getnext                 Get the next permutation(s)/combination(s) for
                        a iterator
iter_wrapper            Wrap iterpc objects by iterators::iter
iterpc                  Efficient Iterator for Permutations and
                        Combinations
multichoose             Calculate multinomial coefficient
nc_multiset             Calculate the number of r-combinations of a
                        multiset
np_multiset             Calculate the number of r-permutations of a
                        multiset
