Combining Texts

You have chosen 'Abstract Objects' by Gideon Rosen, 'Commentary on Euclid's 'Elements'' by Proclus and 'The Nature of Existence vol.1' by J.M.E. McTaggart

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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