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Subclass Hierarchy Tree

- entity
     + physical
     - abstract
          + quantity
          + attribute
          + set or class
          - relation
               - single valued relation
                    + function
                    * valence
                    * unique identifier
                    * age
                    + width
                    * distance
                    * altitude
                    * depth
                    * monetary value
                    * date
                    * mother
                    * father
               + total valued relation
               * partial valued relation
               + binary relation
               + 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