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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.780 Public Health Practice D015980 +
    G03.850.780.200 Communicable Disease Control D003140 +
     G03.850.780.200.800 Sanitation D012499 +
      G03.850.780.200.800.800 Sanitary Engineering D012498 +
       G03.850.780.200.800.800.700 Refuse Disposal D012037 

 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.860 Sanitation D012499 +
    G03.850.860.510 Sanitary Engineering D012498 +
     G03.850.860.510.900 Waste Management D018505 +
      G03.850.860.510.900.600 Refuse Disposal D012037 
        G03.850.860.510.900.600.400 Garbage D005735 
        G03.850.860.510.900.600.900 Waste Disposal, Fluid D014865 
        G03.850.860.510.900.600.600 Medical Waste Disposal D017744 
        G03.850.860.510.900.600.500 Incineration D017745