Combining Texts

You have chosen 'Rearrangement of Particles' by David Lewis, 'New Proof of Possibility of Well-Ordering' by Ernst Zermelo and 'A priori/A posteriori' by Albert Casullo

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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