#football_league  a league of football teams
  supertype:  #league__conference  an association of sports teams that organizes matches for its members
  member:  #football_team__eleven  a team that plays football
     member:  #linebacker__line_backer  the position of a defensive football player who plays close behind the line of scrimmage
     member:  #quarterback__signal_caller__field_general__fieldgeneral  the position of the football player in the backfield who directs the offensive play of his team; "quarterback is the most important position on the team"
     member:  #fullback  the position of a back on a football team
     member:  #halfback  the position of a back on a football team
     member:  #tailback  the position of the offensive back on a football team who lines up farthest from the line of scrimmage
     member:  #wingback  the position of the offensive back who lines up behind or outside the end
     member:  #center.lineman  the position of the player on the line of scrimmage who puts the ball in play; "it is a center's responsibility to get the football to the quarterback"
     member:  #guard.lineman  a position on the line of scrimmage; "guards must be good blockers"
     member:  #tackle  a position on the line of scrimmage; "it takes a big man to play tackle"
     member:  #end.lineman  a position on the line of scrimmage; "no one wanted to play end"
     member:  #backfield  the offensive football players who line up behind the linemen
        member:  #football_back_position__back  the position of a player on a football team who is stationed behind the line of scrimmage
     member:  #secondary  the defensive football players who line up behind the linemen
        member:  #football_back_position__back  the position of a player on a football team who is stationed behind the line of scrimmage
     member:  #linemen  the football players who line up on the line of scrimmage
        member:  #lineman  the position of a player on a football team who is stationed on the line of scrimmage

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