Combining Texts

You have chosen 'The Roots of Reference' by Willard Quine, 'The Periodic Table' by Eric R. Scerri and 'Frege's Concept of Numbers as Objects' by Crispin Wright

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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