combn                   Generate all combinations of the elements of x
                        taken m at a time.
dmnom                   density of multinomial, and support functions
hcube                   Generate all points on a hypercuboid lattice.
nsimplex                Computes the number of points on a (p,
                        n)-simplex lattice
permn                   Generates all permutations of the elements of
                        x
rmultinomial            Generate random samples from multinomial
                        distributions
x2u                     Convert an x-encoded simplex-lattice point to
                        a u-encoded simplex-lattice point
xsimplex                Generates all points on a (p,n) simplex
                        lattice (i.e. a p-part composition of n).