#sloop  a sailing vessel with a single mast set about one third of the boat's length aft of the bow
  supertype:  #sailing_vessel__sailingvessel__sailing_ship__sailingship  a vessel that is powered by the wind; often having several masts
  subtype:  #knockabout  a sloop with a simplified rig and no bowsprit
  subtype:  #raceabout  a small sloop having the keep of a knockabout but with finer lines and carrying more sail

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