pm#situation_playing_some_role  e.g., a causal situation
  subtype:  pm#process_playing_some_role  #resultant  #outcome  #evidence.situation
  supertype:  pm#situation  something that "occurs" in a real/imaginary region of time and space
     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
  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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