Combining Texts

You have chosen 'Letters' by David Hume, 'On What Grounds What' by Jonathan Schaffer 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