Combining Texts

You have chosen 'Ways of Worldmaking' by Nelson Goodman, 'Ideas' by Peter Watson and 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero

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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