vary much. One of the simplest that we know is this:
Take away half of thirteen and let eight remain.
Write XIII on a slate, or on a piece of paper--rub out the lower
half of the figures, and VIII will remain.
Upon the principle of the square-words, riddlers form Diagonals,
Diamonds, Pyramids, Crosses, Stars, &c. These specimens will show
their peculiarities: