Combining Texts

You have chosen 'Isagoge ('Introduction')' by Porphyry, 'Structure and Ontology' by Stewart Shapiro and 'Ethics: Inventing Right and Wrong' by J.L. Mackie

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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