Combining Texts

You have chosen 'Natural Kinds' by Willard Quine, 'The Logical Structure of the World (Aufbau)' by Rudolph Carnap and 'Are Freedom and Equality Compatible?' by G.A. Cohen

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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