Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'Our Knowledge of the External World' by Bertrand Russell and 'Public Text and Common Reader' by Roger Scruton

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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