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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.556 Metals, Heavy D019216 +
    D01.268.556.175 Chromium D002857 


 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.912 Trace Elements D014131 +
    D01.268.912.115 Chromium D002857 


 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.956 Transition Elements D028561 +
    D01.268.956.124 Chromium D002857 


 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.544 Metals, Heavy D019216 +
    D01.552.544.175 Chromium D002857