Combining Texts

You have chosen 'Philosophical Explanations' by Robert Nozick, 'On the Law of War and Peace' by Hugo Grotius and 'Rules for the Direction of the Mind' by Ren Descartes

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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