Combining Texts

You have chosen 'A Puzzle Concerning Matter and Form' by Kit Fine, 'Explanation in Mathematics' by Paolo Mancosu and 'Letters to Descartes' by Elizabeth, Princess of Bohemia

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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