Combining Texts

You have chosen 'Homeostasis, Species and Higher Taxa' by Richard Boyd, 'What is the Basis of Moral Obligation?' by H.A. Prichard and 'Super Epistolam Pauli Apostoli' by Thomas Aquinas

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All the ideas for Reason, or select a subheading:
      A. Nature of Reason
      B. Laws of Thought
      C. Styles of Reason
      D. Definition
      E. Argument
      F. Fallacies