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 D01 Inorganic Chemicals D007287 +
  D01.362 Gases D005740 +
    D01.362.075 Ammonia D000641 
    D01.362.150 Carbon Dioxide D002245 
    D01.362.200 Carbon Monoxide D002248 
    D01.362.225 Chlorine D002713 
    D01.362.641 Noble Gases D005741 +
    D01.362.340 Hydrogen D006859 
    D01.362.350 Hydrogen Sulfide D006862 
    D01.362.625 Nitrogen D009584 
    D01.362.635 Nitrogen Oxides D009589 +
    D01.362.670 Oxygen D010100 
    D01.362.810 Sulfur Dioxide D013458 
    D01.362.820 Sulfur Hexafluoride D013459