#football_back_position__back  the position of a player on a football team who is stationed behind the line of scrimmage
  supertype:  #position.role  (in team sports) the role assigned to an individual player; "what position does he play?"
  subtype:  #linebacker  #quarterback  #fullback  #halfback  #tailback  #wingback
  member of:  #backfield  the offensive football players who line up behind the linemen
     member of:  #football_team__eleven  a team that plays football
        member of:  #football_league  a league of football teams
  member of:  #secondary  the defensive football players who line up behind the linemen
     member of:  #football_team__eleven  a team that plays football

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