Combining Texts

You have chosen 'On Nature Itself (De Ipsa Natura)' by Gottfried Leibniz, 'A Completeness Theorem in Modal Logic' by Saul A. Kripke and 'Intro to 'The Reason's Proper Study'' by B Hale / C Wright

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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