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In The Bag: A sporting event with a pre-determined outcome.
Inside Bet: A bet in roulette on a single number including 0 or 00, or any combination of numbers.
Inside Straight: In poker, four cards of a straight where the straight can only be completed one way.
Insurance: A side bet in Blackjack that's offered when the dealer's upcard is an ace. If the dealer has a Blackjack, the bet is paid 2-1. If the dealer does not, the insurance bet loses.
Insurance Bet: Making two (or more) bets at a craps table, one or the other of which is sure to win.

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