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Denver Broncos rookie running back Devontae Booker, left, is instructed by running backs coach Eric Studesville during the team's Denver Broncos rookie running back Devontae Booker runs during the team's NFL rookie camp football practice Saturday, May 7, 2016, Denver Broncos rookie running back Devontae Booker, left, trails fullback Andy Janovich, center, as they head toward an unidentifi Denver Broncos rookie running back Devontae Booker, left, listens to running backs coach Eric Studesville, front right, as rookie Denver Broncos rookie fullback Andy Janovich, left, and running back Devontae booker are instructed by running backs coach Eric St