#mutual_exclusiveness__incompatibility__inconsistency__repugnance  the relation between propositions that cannot both be true at the same time
  supertype:  contradictoriness__contradictorines  the relation that exists when opposites cannot coexist
     supertype:  oppositeness__opposition  the relation between opposed entities
        supertype:  relation  an abstraction belonging to or characteristic of two entities or parts together
           supertype:  thing_that_can_be_seen_as_a_relation  usable as relation type
              supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                 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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