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 D01 Inorganic Chemicals D007287 +
  D01.029 Acids D000143 +
   D01.029.260 Acids, Noncarboxylic D000148 +
    D01.029.260.700 Phosphorus Acids D017976 +
     D01.029.260.700.675 Phosphoric Acids D010756 +
      D01.029.260.700.675.750 Phosphotungstic Acid D010772 


 D01 Inorganic Chemicals D007287 +
  D01.695 Phosphorus Compounds D017553 +
   D01.695.625 Phosphorus Acids D017976 +
    D01.695.625.675 Phosphoric Acids D010756 +
     D01.695.625.675.750 Phosphotungstic Acid D010772 


 D01 Inorganic Chemicals D007287 +
  D01.940 Tungsten Compounds D017973 +
   D01.940.700 Phosphotungstic Acid D010772