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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.912 Trace Elements D014131 +
     D01.268.912.035 Arsenic D001151 
     D01.268.912.075 Boron D001895 
     D01.268.912.115 Chromium D002857 
     D01.268.912.125 Cobalt D003035 
     D01.268.912.135 Copper D003300 
     D01.268.912.250 Fluorine D005461 
     D01.268.912.400 Iodine D007455 
     D01.268.912.420 Iron D007501 
     D01.268.912.540 Manganese D008345 
     D01.268.912.555 Molybdenum D008982 
     D01.268.912.575 Nickel D009532 
     D01.268.912.825 Selenium D012643 
     D01.268.912.850 Silicon D012825 
     D01.268.912.900 Tin D014001 
     D01.268.912.950 Vanadium D014639 
     D01.268.912.975 Zinc D015032