Combining Texts

You have chosen 'Notes on John Wilkins' by Gottfried Leibniz, 'Expositio super viii libros' by William of Ockham and 'How to Define Theoretical Terms' 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