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In this Aug. 3, 2017 photo, Nebraska defensive back Joshua Kalu warms up exercises at the start of NCAA college football preseason practice in Lincoln, Neb. Kalu, who started at cornerback the last two seasons, moved to safety in the spring and already has received eyebrow-raising praise from defensive coordinator Bob Diaco. (AP Photo/Nati Harnik)

In this Aug. 3, 2017 photo, Nebraska defensive back Joshua Kalu warms up exercises at the start of NCAA college football preseason practice in Lincoln, Neb. Kalu, who started at cornerback the last two seasons, moved to safety in the spring and already has received eyebrow-raising praise from defensive coordinator Bob Diaco. (AP Photo/Nati Harnik)

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