All

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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.860 Sanitation D012499 +
    G03.850.860.510 Sanitary Engineering D012498 +
     G03.850.860.510.090 Biodegradation D001673 
 G04 Biological Phenomena, Cell Phenomena, and Immunity D001687 +
  G04.185 Biological Phenomena D001686 +
   G04.185.149 Biodegradation D001673