Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Science without Numbers' by Hartry Field and 'An Argument for the Identity Theory' 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