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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
               + probability relation
               + spatial relation
               - temporal relation
                    + time
                    * begin fn
                    * end fn
                    * finishes
                    + before or equal
                    + temporally between or equal
                    + overlaps temporally
                    * meets temporally
                    * earlier
                    * cooccur
                    * time interval fn
                    * recurrent time interval fn
                    * when fn
                    * past fn
                    * immediate past fn
                    * future fn
                    * immediate future fn
                    * year fn
                    * month fn
                    * day fn
                    * hour fn
                    * minute fn
                    * second fn
                    * temporal composition fn
                    * relative time fn
               + ternary relation
               + quaternary relation
               + quintary relation
               + list
               + predicate
               + variable arity relation
               + relation extended to quantities
          + proposition
          + graph
          + graph element