pm#thing_categorized_in_an_ontology
  subtype:  p{pm#entity_categorized_in_an_ontology pm#situation_categorized_in_an_ontology}  pm#P3P_thing
  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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