Combining Texts

You have chosen 'works (all lost)' by Ariston, 'The Thesis that Mathematics is Logic' by Hilary Putnam and 'Letter to the Editor about Bayle' by Gottfried Leibniz

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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