Blackjack
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Blackjack (also known as Twenty-one, Vingt-et-un (French for Twenty-one), or Pontoon) is one of the most popular casino card games in the world. Much of blackjack's popularity is due to the mix of chance with elements of skill, and the publicity that surrounds card counting (keeping track of which cards have been played since the last shuffle
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http://en.wikipedia.org/wiki/Blackjack