All

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 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.323 Gravitation D006112 +
    H01.671.323.369 Gravity, Altered D018470 +
     H01.671.323.369.400 Hypogravity D018472 +
      H01.671.323.369.400.900 Weightlessness D014893