A program to Solve the Pentomino Problem by the Recursive Use of Macros A coding technique is described in which certain macro-instructions are given lists as arguments and are thereby used recursively. The discussion covers primarily an example in which the technique is used to solve the pentomino problem-the problem of fitting 12 pentominos without overlapping into a plane area formed of 60 elemental squares. CACM October, 1965 Fletcher, J. G. CA651010 JB March 6, 1978 6:37 PM 1185 5 1185 1185 5 1185 1185 5 1185 1531 5 1185 2707 5 1185 2753 5 1185 1185 6 1185 1185 6 1185 1185 6 1185 1455 6 1185