Combining Texts

You have chosen 'The Mental Life of Some Machines' by Hilary Putnam, 'De aequopollentia causae et effectus' by Gottfried Leibniz and 'Remarks on the forces of inorganic Nature' by J.R. Mayer

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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