Combining Texts

You have chosen 'Human Freedom and Divine choice' by Gottfried Leibniz, 'Papers of 1913' by Bertrand Russell and 'An Axiomatization of Set Theory' by John von Neumann

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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