#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"
  subtype:  blade.runner  ski
  part of:  sled__sledge__sleigh  a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow

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