#built_in_bed__berth__bunk  a bed on a ship or train; usually in tiers
  supertype:  #bed  a piece of furniture that provides a place to sleep; "he sat on the edge of the bed"; "the room had only a bed and chair"
  subtype:  #lower_berth__lowerberth__lower  the lower of two berths
  subtype:  #upper_berth__upperberth__upper  the higher of two berths

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