#natator__swimmer__bather  a person who travels through the water by swimming; "he is not a good swimmer"
  supertype:  #traveler__traveller  a person who changes location
  subtype:  #floater.natator  a swimmer who floats in the water
  subtype:  #skin-diver__aquanaut  an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder
  subtype:  #surfer__surfboarder  someone who engages in surfboarding

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