Combining Texts

You have chosen 'The Ultimate Constituents of Matter' by Bertrand Russell, 'Rearrangement of Particles' by David Lewis and 'On Plural Reference and Set Theory' by Helen Cartwright

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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