A Note on a Combinatorial Problem of Burnett and Coffman CACM March, 1974 Stone, H. S. memories, interleaving, derangements, rencontres, combinatorial analysis 5.39 6.34 CA740312 JB January 18, 1978 10:54 AM 2671 5 2671 2671 5 2671 2671 5 2671