Combining Texts

You have chosen 'Grounding, Transitivity and Contrastivity' by Jonathan Schaffer, 'Higher-Order Logic' by Stewart Shapiro and 'The Problem of the Essential Indexical' by John Perry

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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