SOME SMALL ML EXAMPLES---------------------- roman.sml       Conversion to Roman numerals perms.sml       Efficient generation of the permutations of a list countperms.sml  Generating and counting the permutations of a list queens.sml      An unusual way to solve the N-queens problem countqueens.sml Counting the solutions to the N-queens problem subsets.sml     Generating all subsets of a given set (list) subsum.sml      Generating all subsets with a given element sum