Combining Texts

You have chosen 'works' by Aristotle, 'On Copernicanism and Relativity of Motion' by Gottfried Leibniz 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