Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'The Life of Reason' by George Santayana and 'Against the Logicians (two books)' by Sextus Empiricus

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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