#wall.physical_object  anything that suggests a wall in structure or effect; "a wall of water"; "a wall of smoke"; "a wall of prejudice"
  supertype:  #physical_object__object  a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects"
  subtype:  #footwall  the lower wall of an inclined fault
  subtype:  #hanging_wall__hangingwall  the upper wall of an inclined fault

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