#gaffsail__gaff-headed_sail  a quadrilateral fore-and-aft sail suspended from a gaff
  supertype:  #fore-and-aft_sail  any sail not set on a yard and whose normal position is in a fore-and-aft direction
  part of:  #sailing_vessel__sailingvessel__sailing_ship__sailingship  a vessel that is powered by the wind; often having several masts

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