Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'Answer to 'What is Enlightenment?'' by Immanuel Kant and 'Can there be Vague Objects?' by Gareth Evans

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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