Combining Texts

You have chosen 'Rules for the Direction of the Mind' by René Descartes, 'Consilience' by Edmund O. Wilson and 'Phil Applications of Cognitive Science' by Alvin I. Goldman

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds