#sole.area  the underside of the foot
  supertype:  #area.body_part__region  a part of an animal that has a special function or is supplied by a given artery or nerve; "in the abdominal region"
  part of:  #foot
  part:  #ball.anatomical_structure  a more or less rounded anatomical body or mass; ball of the human foot or ball at the base of the thumb; "he stood on the balls of his feet"

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