text: from mapsite import MapSite
  
  
  class Wall(MapSite):
      def __init__(self):
          super().__init__()
  
      def enter():
          pass
  
      def __repr__(self):
          return "normal wall"
  
  
  class BombedWall(Wall):
      def __init__(self):
          super().__init__()
  
      def enter():
          pass
  
      def __repr__(self):
          return "bombed wall"
  