Combining Texts

You have chosen 'fragments/reports' by Diogenes (Bab), 'Gentzen's Analysis of First-Order Proofs' by Dag Prawitz and 'Mapping the Mind' by Rita Carter

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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