All

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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.556 Metals, Heavy D019216 +
    D01.268.556.337 Hafnium D006195 
 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.956 Transition Elements D028561 +
    D01.268.956.249 Hafnium D006195 
 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.544 Metals, Heavy D019216 +
    D01.552.544.337 Hafnium D006195