Combining Texts

You have chosen 'The Mystery of Consciousness' by John Searle, 'A Tour through Mathematical Logic' by Robert S. Wolf and 'Letter to the Editor about Bayle' by Gottfried Leibniz

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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