#runner.device  device consisting of the parts on which something can slide along
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  part of:  sled
  subtype:  blade.runner  the part of the skate that slides on the ice
  subtype:  ski__skis  narrow wood or metal or plastic runners used for gliding over snow
     subtype:  water_ski__waterski  broad ski for skimming over water towed by a speedboat

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