Combining Texts

You have chosen 'On the Question of Absolute Undecidability' by Peter Koellner, 'Rules for the Direction of the Mind' by Ren Descartes and 'Self, Body and Coincidence' by Sydney Shoemaker

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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