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ADVANCE FOR WEEKEND EDITIONS, AUG. 25-26 - This Aug. 14, 2012 file photo shows Mark Sanchez, left, and Tim Tebow set to throw during drills at New York Jets training camp in Cortland, N.Y. Two-quarterback systems have rarely worked, but the Jets plan to test that theory with Sanchez and Tebow this season. (AP Photo/Kevin Rivoli, File)

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