Combining Texts

You have chosen 'A Tour through Mathematical Logic' by Robert S. Wolf, 'True Method in Philosophy and Theology' by Gottfried Leibniz and 'Rearrangement of Particles' by David Lewis

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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