All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.439 Hydrocarbons, Chlorinated D006843 +
     D02.455.526.439.220 Chlorofluorocarbons D017402 +
       D02.455.526.439.220.300 Chlorofluorocarbons, Methane D005617 
 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.510 Hydrocarbons, Fluorinated D006845 +
     D02.455.526.510.140 Chlorofluorocarbons D017402 +
       D02.455.526.510.140.300 Chlorofluorocarbons, Methane D005617