You are dealt a hand of five cards from a standard deck of playing cards.  Find the probability of being dealt a hand consisting of:

1. four-of-a-kind.
   {#1}
   
   
2. a full house which consists of 1 three-of-a-kind and 1 two-of-a-kind.
   {#2}
   
   
3. three-of-a-kind.  (The other cards are different from each other.)
   {#3}
   
   
4. two clubs and one of each other suits.
   {#4}