Combining Texts

You have chosen 'Explanation: the state of play' by Michael Stanford, 'Principia Mathematica' by Isaac Newton and 'Letters to a Young Clergyman' by Jonathan Swift

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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