Combining Texts

You have chosen 'Survival and Identity, with postscript' by David Lewis, 'A Universe from Nothing' by Lawrence M. Krauss and 'Two letters on mind' by Ren Descartes

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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