Combining Texts

You have chosen 'Enquiry concerning Principles of Morals' by David Hume, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach

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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