Combining Texts

You have chosen 'The Philosophy of Nature: new essentialism' by Brian Ellis, 'Principles of Theoretical Logic' by Hilbert,D/Ackermann,W and 'talk' by Martin Luther

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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