||Larry's categories overlap. For example, he has
counted 60 days for vacation, during which time
he will both eat and sleep, activities that he has
already counted separately. The 60 vacation days
also include weekends, another category that he
has already counted separately. He should not count
the same periods of time more than once.
Inspired by a puzzle inMathematical
Puzzlesby Martin Gardner. New York: Thomas
Y. Crowell Company, 1961.