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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.033 Actinoid Series Elements D008671 +
    D01.268.033.725 Protactinium D011478 


 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.271 Elements, Radioactive D004603 +
    D01.268.271.545 Actinoid Series Elements D008671 +
     D01.268.271.545.725 Protactinium D011478 


 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.556 Metals, Heavy D019216 +
    D01.268.556.750 Protactinium D011478 


 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.517 Actinoid Series Elements D008671 +
    D01.552.517.778 Protactinium D011478 


 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.544 Metals, Heavy D019216 +
    D01.552.544.750 Protactinium D011478