Oakland Raiders defensive end Khalil Mack leads a group of players through a drill during an NFL football training camp Monday, July 31, 2017, in Napa, Calif. (AP Photo/Eric Risberg)
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Oakland Raiders defensive end Khalil Mack leads a group of players through a drill during an NFL football training camp Monday, July 31, 2017, in Napa, Calif. (AP Photo/Eric Risberg)
