there are 3 spectators.the deck is shuffled by one of the three.The first spectator is asked to name a number between 10 and 20.he names 17.he deals 17 cards and holds them.the second spec is asked to name a number between 10 and 20.he names 12.he deals 12 cards and holds them.the third spec is asked to name a number between 1 and 5.he names 3.now the cards are counted by each spec.the first one is holding 3 less,that is 14.the second spec has 3 more,that is 15.the deck doesnt look gimmicked.I saw this on tv.where can i learn this?