#hectogram__hg  100 grams
  supertype:  #metric_weight_unit__weight_unit  a decimal unit of weight based on the gram
  part of:  #kilogram
  part:  #dekagram__decagram__dkg__dag  10 grams
     part:  #gram__gramme__gm__g  a metric unit of weight equal to one thousandth of a kilogram
        part:  #obolus  a Greek unit of weight equal to one tenth of a gram
        part:  #carat  a unit of weight for precious stones = 200 mg
           part:  #decigram__dg  1/10 gram
              part:  #metric_grain__grain  used for pearls or diamonds: 50 mg or 1/4 carat
                 part:  #milligram__mg  1/1000 gram
                    part:  #microgram__mcg  one millionth of a gram

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