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Subclass Hierarchy Tree

- entity
     + physical
     - abstract
          - quantity
               + number
               - physical quantity
                    - constant quantity
                         - time measure
                              + time duration
                              - time position
                                   - time interval
                                        + year
                                        + month
                                        - day
                                             * monday
                                             * tuesday
                                             * wednesday
                                             * thursday
                                             * friday
                                             * saturday
                                             * sunday
                                        * week
                                        * hour
                                        * minute
                                        * second
                                   + time point
                         + length measure
                         + mass measure
                         * area measure
                         + volume measure
                         + temperature measure
                         + currency measure
                         + angle measure
                         + information measure
                    + function quantity
                    + unit of measure
          + attribute
          + set or class
          + relation
          + proposition
          + graph
          + graph element