Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'The Epistemology of Essence (draft)' by Tuomas E. Tahko and 'Action, Intention and Reason' by Robert Audi

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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