pm#amount_of_matter
  supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
     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#divisible_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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