Combining Texts

You have chosen 'Notes on John Wilkins' by Gottfried Leibniz, 'The Ultimate Constituents of Matter' by Bertrand Russell and 'Set Theory and the Continuum Hypothesis' by Paul J. Cohen

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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