Combining Texts

You have chosen 'The Discourses' by Epictetus, 'How the Laws of Physics Lie' by Nancy Cartwright and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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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