#chain.linear_unit  a unit of length
  supertype:  #linear_unit  a unit of measurement of length
  part:  #yard  #link.linear_unit
  subtype:  #Gunter's_chain  a unit of length (22 yards)
  subtype:  #engineer's_chain  a unit of length (100 ft)
  subtype:  #nautical_chain  a nautical unit of length (15 ft)

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