Combining Texts

You have chosen 'works (all lost)' by Ariston, 'The Thesis that Mathematics is Logic' by Hilary Putnam and 'Letter to the Editor about Bayle' 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