Combining Texts

You have chosen 'The Case for Closure' by John Hawthorne, 'Building Blocks of Mathematical Logic' by Moses Schnfinkel and 'Logicism and Ontological Commits. of Arithmetic' by Harold Hodes

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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