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Subclass Hierarchy Tree

- entity
     - physical
          - object
               - self connected object
                    - substance
                         - pure substance
                              + elemental substance
                              + compound substance
                         + mixture
                         + biologically active substance
                    + corpuscular object
                    + content bearing object
                    + food
               + region
               + collection
               + agent
          + process
     + abstract