Combining Texts

You have chosen 'Calculus Ratiocinator' by Gottfried Leibniz, 'Philosophy and the Nature of Language' by David E. Cooper and 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer

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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