FILE -This Jan. 31, 2014 file photo, shows former NFL football player Troy Vincent in New York. Vincent, the new director of football operations, can see in the NFL's future a developmental league, an eighth official on the field for games, and coaches using tablets on the sidelines to call plays, he said in an interview Friday, April 25, 2014. Vincent, president of the players' union, recently replaced Ray Anderson, who left the league to become athletic director at Arizona State. (AP Photo/Matt Slocum, File)
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