pm#undivisible_thing__undivisiblething  thing with no proper part
  closed_exclusion:  divisible_thing
  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
  subtype:  atom__At
     subtype:  temporary_atom__temporaryatom__At
  subtype:  undivisible_entity__undivisibleentity  many classifications under this category are application-dependant

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