|Stack of Cards|
|Puzzle 1:Take one pair each of Aces, 2ís, 3ís, and 4ís from a deck of
playing cards and discard the rest of the deck. Now stack these eight cards so
that the Aces have one card between them, the 2ís have two cards between them,
the 3ís have three cards between them, and the 4ís have four cards between
Bonus:Do the same with 14 cards numbered Ace through 7.
There are many solutions. Here are two of them.