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Subclass Hierarchy Tree

- entity
     + physical
     - abstract
          + quantity
          + attribute
          + set or class
          - relation
               + single valued relation
               + total valued relation
               * partial valued relation
               - binary relation
                    + reflexive relation
                    + irreflexive relation
                    + symmetric relation
                    - antisymmetric relation
                         + asymmetric relation
                         + partial ordering relation
                    + trichotomizing relation
                    + transitive relation
                    + intransitive relation
                    + unary function
                    + binary predicate
                    * distributes
               + probability relation
               + spatial relation
               + temporal relation
               + ternary relation
               + quaternary relation
               + quintary relation
               + list
               + predicate
               + variable arity relation
               + relation extended to quantities
          + proposition
          + graph
          + graph element