Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis and 'The Thesis that Mathematics is Logic' by Hilary Putnam

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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