#sailboat__sailing_boat__sailingboat  a small sailing vessel; usually with a single mast
  supertype:  #sailing_vessel__sailingvessel__sailing_ship__sailingship  a vessel that is powered by the wind; often having several masts
  subtype:  #catamaran  #catboat  #trimaran
  part:  #centerboard__centreboard__drop_keel__sliding_keel__slidingkeel  a retractable fin keel used on sailboats to prevent drifting to leeward

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