Combining Texts

You have chosen 'An Argument for the Identity Theory' by David Lewis, 'The Nature of Mathematical Knowledge' by Philip Kitcher and 'In Defence of Pure Reason' by Laurence Bonjour

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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