Combining Texts

You have chosen 'On Plural Reference and Set Theory' by Helen Cartwright, 'Essential vs Accidental Properties' by Adolph Rami and 'Letter to the Editor about Bayle' by Gottfried Leibniz

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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