Combining Texts

You have chosen 'Why coherence is not enough' by James Van Cleve, 'Letters to Voetius' by Ren Descartes and 'Remarks on the definition and nature of mathematics' by Haskell B. Curry

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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