Combining Texts

You have chosen 'On boundary numbers and domains of sets' by Ernst Zermelo, 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Darwin's Dangerous Idea' by Daniel C. Dennett

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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