Combining Texts

You have chosen 'On Plural Reference and Set Theory' by Helen Cartwright, 'Pacidius Philalethi dialogue' by Gottfried Leibniz and 'Frege on Extensions from Concepts' by Tyler Burge

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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