Combining Texts

You have chosen 'Reply to Richards' by H. Paul Grice, 'Concepts and Counting' by Ian Rumfitt and 'Rules for the Direction of the Mind' by Ren Descartes

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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