Combining Texts

You have chosen 'Letter to the Editor about Bayle' by Gottfried Leibniz, 'Building Blocks of Mathematical Logic' by Moses Schnfinkel and 'Reasons and Persons' by Derek Parfit

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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