Combining Texts

You have chosen 'Set Theory' by Kenneth Kunen, 'Human Freedom and Divine choice' by Gottfried Leibniz and 'A Slim Book about Narrow Content' by Gabriel M.A. Segal

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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