Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'The Dappled World' by Nancy Cartwright and 'From an Ontological Point of View' by John Heil

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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