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Subclass Hierarchy Tree

- entity
     - physical
          - object
               - self connected object
                    - substance
                         + pure substance
                         - mixture
                              * solution
                              * mineral
                              - body substance
                                   * hormone
                                   * blood
                                   + tissue
                         + biologically active substance
                    + corpuscular object
                    + content bearing object
                    + food
               + region
               + collection
               + agent
          + process
     + abstract