Combining Texts

You have chosen 'On the Plurality of Worlds' by David Lewis, 'On the Basis of Morality' by Arthur Schopenhauer and 'New system of communication of substances' 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