#cap.top  a top (as for a bottle)
  supertype:  #top.covering  covering for a hole (especially a hole in the top of a container); "he removed the top of the carton"; "he couldn't get the top off of the bottle"; "put the cover back on the kettle"
  subtype:  #bottlecap  a cap that seals a bottle
  subtype:  #radiator_cap  cap on the opening in the top of a radiator through which a coolant liquid can be added

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