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Photo by: Matt Slocum

FILE - In this file photo taken Sept. 12, 2010, Philadelphia Eagles quarterback Kevin Kolb, left, is sacked by Green Bay Packers linebacker Clay Matthews in the first half of an NFL football game in Philadelphia. Kolb sustained a concussion on the hit, paving the way for Michael Vick to come off the bench and star in perhaps the most compelling comeback story in NFL history. (AP Photo/Matt Slocum, File)

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