#stroke.locomotion  any one of the repeated movements of the limbs and body used for locomotion in swimming or rowing
  supertype:  #locomotion__travel  self-propelled movement
  subtype:  #swimming_stroke  a method of moving the arms and legs to push against the water and propel the swimmer forward
     subtype:  #Australian_crawl__crawl__front_crawl__frontcrawl  a swimming stroke; arms are moved alternately overhead accompanied by a flutter kick
     subtype:  #dog_paddle__dogpaddle  an elementary swimming stroke imitating a swimming dog
     subtype:  #sidestroke  a swimming stroke in which the arms move forward and backward while the legs do a scissors kick
     subtype:  #butterfly_stroke__butterflystroke__butterfly  a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down
     subtype:  #breaststroke  a swimming stroke; the arms are extended together in front of the head and swept back on either side accompanied by a frog kick
     subtype:  #backstroke  a swimming stroke that resembles the crawl except the swimmer lies on his or her back
     subtype:  #treading_water  a stroke that keeps the head above water by thrashing the legs and arms

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