Combining Texts

You have chosen 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach, '(Nonsolipsistic) Conceptual Role Semantics' by Gilbert Harman and 'Explanation - Opening Address' by J.J.C. Smart

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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