Combining Texts

You have chosen 'The Universe as We Find It' by John Heil, 'Letter on Freedom' by Gottfried Leibniz and 'A Theory of Conditionals' by Robert C. Stalnaker

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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