Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'An Inquiry into Meaning and Truth' by Bertrand Russell and 'The Strangest Man' by Graham Farmelo

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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