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Gridiron football

Gridiron football, also known as North American football or simply football, is a football sport primarily played in the United States and Canada. American football, which uses 11-player teams, is the form played in the United States and the best known form worldwide, while Canadian football, featuring 12-player teams, predominates in Canada. Other derivative varieties include indoor football, football for smaller teams, and informal games such as touch and flag football. Football is played at professional, collegiate, semi-professional, and amateur levels.
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