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| | football. The Columbia Encyclopedia, Sixth Edition. 2001-05 |
 | | Football, amateur and professional, is perhaps the most popular spectator sport in the United States, attracting a total attendance of over 40 million and watched by many more millions on television each year. |
 | | Canadian football is similar to the U.S. game, but the Canadian field and end zone are larger, measuring 110 yd by 65 yd (100 m by 59 m) and 25 yd by 65 yd (23 m by 59 m), respectively. |
 | | Canadian teams have 12 players on the field rather than 11 and, among other variations in the rules, are allowed only three downs to advance the ball 10 yards. |
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