Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'Are there propositions?' by Gilbert Ryle and 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer

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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