Combining Texts

You have chosen 'On Plural Reference and Set Theory' by Helen Cartwright, 'On Anger (Book 3)' by Seneca the Younger and 'Two Concepts of Liberty' by Isaiah Berlin

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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