Combining Texts

You have chosen 'On the Nature of the Universe' by Lucretius, 'Presidential Address of Am. Math. Soc' by Oswald Veblen and 'Replies on 'Limits of Abstraction'' by Kit Fine

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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