#holy_of_holies  something that is regarded as inviolable or sacred; "every politician fears to touch that holy of holies, the Social Security System"
  supertype:  pm#entity_playing_some_role  e.g., an agent, an owner
     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#thing_that_can_be_seen_as_a_relation  usable as relation type
        supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
           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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