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Denver Broncos qurterback Peyton Manning, back, stretches along with free safety Rahim Moore during off season training camp at the NFL football team's training facility in Englewood, Colo., on Monday, May 20, 2013. (AP Photo/David Zalubowski)
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Denver Broncos free safety Rahim Moore jokes with teammates after an off=season training camp at the NFL football team's training facility in Englewood, Colo., on Monday, May 20, 2013. (AP Photo/David Zalubowski)
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San Diego Chargers rookie linebacker Manti Te'o, right, runs a drill during Chargers training camp Monday, May 20, 2013, in San Diego. (AP Photo/Gregory Bull)
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San Diego Chargers rookie linebacker Manti Te'o grabs a catch during Chargers training camp Monday, May 20, 2013, in San Diego. (AP Photo/Gregory Bull)
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Detroit Lions wide receiver Calvin Johnson (81) on the sideline against the Chicago Bears during an NFL football game in Detroit, Sunday, Dec. 30, 2012. (AP Photo/Rick Osentoski)
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Detroit Lions wide receiver Calvin Johnson (81) on the sideline against the Chicago Bears during an NFL football game in Detroit, Sunday, Dec. 30, 2012. (AP Photo/Rick Osentoski)
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Denver Broncos free safety Rahim Moore, right, is surrounded by reporters after taking part in an off-season training camp at the NFL football team's training headquarters in Englewood, Colo., on Monday, May 20, 2013. (AP Photo/David Zalubowski)
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Denver Broncos wide receiver Wes Welker talks to reporters after taking part in an off-season training camp at the NFL football team's training headquarters in Englewood, Colo., on Monday, May 20, 2013. (AP Photo/David Zalubowski)