A Numbering Systems for Combinations CACM January, 1974 Knott, G. D. combinatorics, coding system, storage mapping function 4.9 5.30 CA740109 JB January 18, 1978 1:42 PM 2690 4 2690 2690 4 2690 2853 4 2690 3115 4 2690 203 5 2690 2690 5 2690 2690 5 2690 2690 5 2690 2853 5 2690 579 5 2690 2690 6 2690 579 6 2690