Combining Texts

You have chosen 'Why coherence is not enough' by James Van Cleve, 'Letters to Frege' by Bertrand Russell and 'The Logical Structure of the World (Aufbau)' by Rudolph Carnap

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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