Combining Texts

You have chosen 'The Epic of Gilgamesh' by Anon (Gilg), 'An Axiomatization of Set Theory' by John von Neumann and 'Remarks on axiomatised set theory' by Thoralf Skolem

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature