#trace  either of two lines that connect a horse's harness to a wagon or other vehicle or to a whiffletree
  supertype:  line.artifact  something (as a cord or rope) that is long and thin and flexible; "a washing line"
  part of:  harness.stable_gear__harnes  stable gear consisting of an arrangement of leather straps fitted to a draft animal so that it can be attached to and pull a cart

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