Combining Texts

You have chosen 'Letters to Antoine Arnauld' by Gottfried Leibniz, 'A Tour through Mathematical Logic' by Robert S. Wolf and 'The Power of Words' by Simone Weil

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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