#running_back__runningback  (football) a back on the offensive team (a fullback or halfback) who tries to advance the ball by carrying it on plays from the line of scrimmage
  supertype:  #back.football_player  (football) a person who plays in the backfield
  subtype:  #fullback.running_back  (football) the running back who plays the fullback position on the offensive team
  subtype:  #halfback.running_back  (football) the running back who plays the offensive halfback position

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