Combining Texts

You have chosen 'The Middle Works (15 vols, ed Boydston)' by John Dewey, 'Rules for the Direction of the Mind' by Ren Descartes and 'A Note on the entscheidungsproblem' by Alonzo Church

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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