All

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 D27 Chemical Actions and Uses D020164 +
  D27.720 Specialty Uses of Chemicals D020313 +
   D27.720.777 Poisons D011042 +
    D27.720.777.300 Chemical Warfare Agents D002619 
 D27 Chemical Actions and Uses D020164 +
  D27.888 Toxic Actions D004786 +
   D27.888.569 Noxae D009676 +
    D27.888.569.612 Poisons D011042 +
     D27.888.569.612.150 Chemical Warfare Agents D002619