Combining Texts

You have chosen 'A World of States of Affairs' by David M. Armstrong, 'Empiricism, Semantics and Ontology' by Rudolph Carnap and 'The Structure of Science' by Ernest Nagel

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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