Generator of Set-Partitions to Exactly R Subsets [G7] (Algorithm A477) CACM April, 1974 Ehrich, G. partitions, subset generation, permutations 5.39 CA740416 JB January 17, 1978 4:46 PM 2653 4 2654 2654 4 2654 1955 5 2654 2654 5 2654 2654 5 2654 2654 5 2654