Combining Texts

You have chosen 'Axiomatic Theories of Truth (2005 ver)' by Volker Halbach, 'On the Concept of Number' by David Hilbert and 'Confessions of a Philosopher' by Bryan Magee

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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