Nfl

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Washington Redskins head coach Mike Shanahan looks on during an NFL football game against the Carolina Panthers, Sunday, Nov. 4, 2012, in Landover, Md. (AP Photo/Nick Wass)

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Buffalo Bills running back Fred Jackson (22), center, tries to escape the grasp of New England Patriots cornerback Devin McCourty (32), left, in the second quarter of an NFL football game at Gillette Stadium, in Foxborough, Mass., Sunday, Nov. 11, 2012. (AP Photo/Steven Senne)

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Tampa Bay Buccaneers outside linebacker Quincy Black (58) gives a thumbs-up to the crowd as he leaves the field after being injured in a third-quarter collision with San Diego Chargers running back Ryan Mathews during an NFL football game on Sunday, Nov. 11, 2012, in Tampa, Fla. (AP Photo/Brian Blanco)

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Philadelphia Eagles quarterback Michael Vick leaves the field after suffering a concussion during the second quarter of an NFL football game against the Dallas Cowboys, Sunday, Nov. 11, 2012, in Philadelphia. (AP Photo/Philadelphia Daily News, Yong Kim) THE EVENING BULLETIN OUT, TV OUT; MAGS OUT; NO SALES

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Houston Texans cornerback Kareem Jackson (25) celebrates his interception against the Chicago Bears with teammates Shiloh Keo (31) and Glover Quin (29) during the first half an NFL football game, Sunday, Nov. 11, 2012, in Chicago. (AP Photo/Charles Rex Arbogast)

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Dallas Cowboys quarterback Tony Romo, right, passes under pressure from Philadelphia Eagles middle linebacker DeMeco Ryans in the first half of an NFL football game, Sunday, Nov. 11, 2012, in Philadelphia. (AP Photo/Julio Cortez)

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New York Jets' DeMario Davis trails Seattle Seahawks' Marshawn Lynch on a long run during the first half of an NFL football game, Sunday, Nov. 11, 2012, in Seattle. (AP Photo/Elaine Thompson)