Combining Texts

You have chosen 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero, 'Knowledge and the Philosophy of Number' by Keith Hossack and 'The Sceptical Chemist' by Robert Boyle

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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