Combining Texts

You have chosen 'The Search After Truth' by Nicolas Malebranche, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'Letters to Lelong' 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