All

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 D27 Chemical Actions and Uses D020164 +
  D27.720 Specialty Uses of Chemicals D020313 +
   D27.720.821 Riot Control Agents, Chemical D012304 +
     D27.720.821.498 Irritants D007509 +
 D27 Chemical Actions and Uses D020164 +
  D27.888 Toxic Actions D004786 +
   D27.888.569 Noxae D009676 +
    D27.888.569.734 Riot Control Agents, Chemical D012304 +
      D27.888.569.734.498 Irritants D007509 +