- ALLCOMB function
-
generates all combinations of
elements taken 
at a time
- ALLPERM function
-
generates all permutations of
elements
- RANCOMB function
-
returns random combinations of
elements taken at a time
- RANPERK function
-
returns generates a random permutation of
elements from a finite set of elements, 
- RANPERM function
-
returns random permutations of
elements