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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.477 Lanthanoid Series Elements D028581 +
    D01.268.477.992 Ytterbium D015018 


 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.558 Metals, Rare Earth D008674 +
    D01.268.558.362 Lanthanoid Series Elements D028581 +
     D01.268.558.362.992 Ytterbium D015018 


 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.550 Metals, Rare Earth D008674 +
    D01.552.550.399 Lanthanoid Series Elements D028581 +
     D01.552.550.399.992 Ytterbium D015018