10. Singular arrangement of sixteen cards.
Take the four kings, the four queens, the four knaves, and the
four tens of a pack, and ask if there be any one in the company
who can form a square with them in such a manner that, taken in
any direction, from right to left, from the top to the bottom, by
the diagonal--anyhow, in fact--there will always be in each line
a king, queen, knave, and a ten. Everybody will think the thing
easy, but it is certain that no one will succeed in doing it.
When they 'give it up,' take the sixteen cards and arrange them
as shown, when the king, queen, knave, and ten will stand as