Certification of Algorithm 161 Combinatorial of M Things Taken One at a Time, Two at a Time, Up to N at a Time [M. L. Wolfson and H. V. Wright, Comm. ACM, Apr. 1963] CACM August, 1963 Thoro, D. CA630831 JB March 13, 1978 8:13 PM 767 5 767 767 5 767 767 5 767