Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Frege philosophy of mathematics' by Michael Dummett and 'De Mundo (On the World)' by Thomas Hobbes

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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