#raft  a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers
  supertype:  #float  something that remains on the surface of a liquid
  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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