Combining Texts

You have chosen 'Mathematical Explanation' by Mark Steiner, 'On Plural Reference and Set Theory' by Helen Cartwright and 'Real Natures and Familiar Objects' by Crawford L. Elder

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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