Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Notice of Fine's 'Limits of Abstraction'' by R Cook / P Ebert and 'Must We Believe in Set Theory?' by George Boolos

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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