Combining Texts

You have chosen 'Letters to Remond de Montmort' by Gottfried Leibniz, 'Inference to the Best Explanation (2nd)' by Peter Lipton and 'Counterpart theory and Quant. Modal Logic' 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