Combining Texts

You have chosen 'Counting and the Natural Numbers' by Jeffrey H. Sicha, 'Rules for the Direction of the Mind' by Ren Descartes and 'The Disorder of Things' by John Dupr

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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