Combining Texts

You have chosen 'A Combinatorial Theory of Possibility' by David M. Armstrong, 'The Establishment of Scientific Semantics' by Alfred Tarski and 'Anselm and Actuality' by David Lewis

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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