Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Elucidation of some points in E.Schrder' by Gottlob Frege and 'The Roots of Reference' by Willard Quine

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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