Combining Texts

You have chosen 'Reference and Necessity' by Robert C. Stalnaker, 'There are no ordinary things' by Peter Unger and 'Tarski on Truth and Logical Consequence' by John Etchemendy

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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