Combining Texts

You have chosen 'On Body and Force, Against the Cartesians' by Gottfried Leibniz, 'Essentialists and Essentialism' by Michael della Rocca and 'On Duties ('De Officiis')' 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