==> geometry/calendar.p <==
Build a calendar from two sets of cubes.  On the first set, spell the
months with a letter on each face of three cubes.  Use lowercase
three-letter English abbreviations for the names of all twelve months
(e.g., "jan", "feb", "mar").  On the second set, number the days with a
digit on each face of two cubes (e.g., "01", "02", etc.).