FILE - In this Sunday, Dec. 17, 2017, file photo, referee Gene Steratore (114) carries a folded piece of paper used to determine a measurement next to Oakland Raiders defensive end Khalil Mack (52) during the second half of an NFL football game between the Raiders and the Dallas Cowboys in Oakland, Calif. The NFL on Thursday, Dec. 21, 2017, has told its officials not to use index cards or any other paper to aid in measurements. (AP Photo/Eric Risberg, File)
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