Combining Texts

You have chosen 'A Realistic Theory of Categories' by Roderick Chisholm, 'Non-Monotonic Logic' by G. Aldo Antonelli and 'The Rediscovery of the Mind' by John Searle

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories