Combining Texts

You have chosen 'Classical Cosmology (frags)' by T.M. Robinson, 'There Are No Abstract Objects' by Cian Dorr and 'An Argument for the Identity Theory' by David Lewis

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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