old_contents: from referee_chair import Referee
  from game_table import TableTop
  
  def play_xox():
      tabletop = TableTop()
      ref = Referee(tabletop)
      ref.start_game()
  
  if __name__ == "__main__":
      play_xox()
  
new_contents: from control_booth import *
  
  if __name__ == "__main__":
      xox = StageManager()
      xox.play_game()
  
subject: switch out old Referee for new Stage Manager