Assume that a standard deck of 52 playing cards is randomly
shuffled (13 cards of 4 types of suits - clubs, diamonds, hearts,
and spades). If Alex draws a card from it 4 times with replacement,
how many different combinations of suits can he get? (Suppose we
further assume that the order doesn't matter: (clubs, diamonds,
hearts, hearts) is equal to (hearts, clubs, diamonds, hearts).
However, (clubs, diamonds, hearts, hearts) is different with
(hearts, clubs, clubs, hearts).)