Combining Texts

You have chosen 'Rechnungsmethoden (dissertation)' by Gottlob Frege, 'Among the Dead Cities' by A.C. Grayling and 'On Mental Entities' by Willard Quine

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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