Combining Texts

You have chosen 'An Essay on Free Will' by Peter van Inwagen, 'Writing the Book of the World' by Theodore Sider and 'A Tour through Mathematical Logic' by Robert S. Wolf

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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