Combining Texts

You have chosen 'Proof of an External World' by G.E. Moore, 'A Puzzle about Belief' by Saul A. Kripke and 'Could There Be Unicorns?' by Michael Dummett

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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