#float  something that remains on the surface of a liquid
  supertype:  #artifact__artefact  a man-made object taken as a whole
  subtype:  #bobber__bob__cork__bobfloat  a small float usually made of cork; attached to a fishing line
  subtype:  #chip  (nautical) a triangular wooden float attached to the end of a log line
  subtype:  #pontoon  a float supporting a seaplane
  subtype:  #raft  a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers
     subtype:  #balsa_raft__balsaraft__Kon_Tiki  a light raft made of balsa
     subtype:  #life_raft__Carling_float  a raft to use if a ship must be abandoned in an emergency

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