Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'Inverted Earth' by Ned Block and 'The Problem of Empty Names' by Marga Reimer

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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