Combining Texts

You have chosen 'Croce and Collingwood' by Gary Kemp, 'Could There Be Unicorns?' by Michael Dummett and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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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