Combining Texts

You have chosen 'Lectures on Ethics' by Immanuel Kant, 'On the Law of War and Peace' by Hugo Grotius and 'Remarks on axiomatised set theory' by Thoralf Skolem

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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