Combining Texts

You have chosen 'The Scope and Language of Science' by Willard Quine, 'Actualism and Thisness' by Robert Merrihew Adams 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