Combining Texts

You have chosen 'works' by Bernard Williams, 'Must We Believe in Set Theory?' by George Boolos and 'Aristotle on Learning to be Good' by Myles F. Burnyeat

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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