Combining Texts

You have chosen 'Elements of Mind' by Tim Crane, 'Real Natures and Familiar Objects' by Crawford L. Elder and 'Frege versus Cantor and Dedekind' by William W. Tait

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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