Combining Texts

You have chosen 'A Slim Book about Narrow Content' by Gabriel M.A. Segal, 'Letters to Antoine Arnauld' by Gottfried Leibniz and 'Concepts and Counting' by Ian Rumfitt

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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