pm#undivisible_thing__undivisiblething  thing with no proper part
  closed_exclusion:  divisible_thing
  subtype:  atom  undivisible_entity
  supertype:  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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