Combining Texts

You have chosen 'Fact, Fiction and Forecast (4th ed)' by Nelson Goodman, 'The Universe as We Find It' by John Heil and 'Giordano Bruno and Hermetic Tradition' by Frances A. Yates

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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