Combining Texts

You have chosen 'A Combinatorial Theory of Possibility' by David M. Armstrong, 'Oxford University Statutes' by Oxford Univ 1350 and 'On the Plurality of Worlds' 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