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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.132 Energy-Generating Resources D004736 +
    G03.230.132.580 Nuclear Energy D009678 +
      G03.230.132.580.500 Nuclear Fission D009680 
      G03.230.132.580.520 Nuclear Fusion D009681 

 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.579 Nuclear Physics D009686 +
    H01.671.579.580 Nuclear Energy D009678 +
      H01.671.579.580.485 Nuclear Fission D009680 
      H01.671.579.580.652 Nuclear Fusion D009681