Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess and 'Virtue Theory and Abortion' by Rosalind Hursthouse

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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