Combining Texts

You have chosen 'Ways of Worldmaking' by Nelson Goodman, 'The Methods of Ethics (7th edn)' by Henry Sidgwick and 'Two-Dimensional Semantics' by Laura Schroeter

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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