Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'The Theory of Logical Types' by Bertrand Russell and 'The Problem of Natural Laws' by L. Jonathan 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