#basketball_league  a league of basketball teams
  supertype:  #league__conference  an association of sports teams that organizes matches for its members
  member:  #basketball_team__five  a team that plays basketball
     member:  #forward  a position on a basketball team
     member:  #center.basketball_position  a position on a basketball team of the player who participates in the center jump to start the game
     member:  #guard.position  a position on a basketball team

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