#popper.stimulant_drug  a container of stimulant drug (amyl nitrate or butyl nitrite)
  supertype:  #stimulant_drug__stimulantdrug__stimulant  a drug that temporarily quickens some vital process
     supertype:  #drug  a substance that is used as a medicine or narcotic
        supertype:  #agent.causal_agent  a substance that exerts some force or effect
           supertype:  #causal_agent__cause__causal_agency  any entity that causes events to happen
              supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                 supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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