Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Rules for the Direction of the Mind' by Ren Descartes and 'Examination of McTaggart's Philosophy' by C.D. Broad

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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