#gait.locomotion  a horse's manner of moving
  supertype:  #locomotion__travel  self-propelled movement
  subtype:  #walk.gait  a slow gait of a horse in which two feet are always on the ground
  subtype:  #single-foot__rack  a rapid gait of a horse in which each foot strikes the ground separately
  subtype:  #jog_trot__jogtrot  an easy gait of a horse; midway between a walk and a trot
  subtype:  #trot  a gait faster than a walk; diagonally opposite legs strike the ground together
     subtype:  #rising_trot  the rider rises from the saddle every second stride
     subtype:  #sitting_trot__sittingtrot  the rider sits still in the saddle
  subtype:  #canter__lope  an smooth 3-beat gait; between a trot and a gallop
  subtype:  #gallop  a fast gait of a horse; a two-beat stride during which all four legs are off the ground simultaneously

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