All

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 D26 Pharmaceutical Preparations D004364 +
  D26.255 Dosage Forms D004304 +
   D26.255.165 Colloids D003102 +
    D26.255.165.055 Aerosols D000336 +
      D26.255.165.055.055 Aerosol Propellants D000335 
 D27 Chemical Actions and Uses D020164 +
  D27.720 Specialty Uses of Chemicals D020313 +
   D27.720.280 Dosage Forms D004304 +
    D27.720.280.165 Colloids D003102 +
     D27.720.280.165.055 Aerosols D000336 +
       D27.720.280.165.055.055 Aerosol Propellants D000335