pm#undivisible_entity__undivisibleentity  many classifications under this category are application-dependant
  closed_exclusion:  pm#divisible_entity
  supertype:  pm#entity  something that can be "involved" in a situation
     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#undivisible_thing__undivisiblething  thing with no proper part
     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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