Betting on team sports has become an important service industry in many countries. For example, millions of Britons play the football pools every week. In addition to organized sports betting, both legal and illegal, there are many side-betting games played by casual groups of spectators, such as NCAA Basketball Tournament Bracket Pools, Super Bowl Squares, Fantasy Sports Leagues with monetary entry fees and winnings, and in-person spectator games like Moundball.

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