Combining Texts

You have chosen 'A Puzzle about Belief' by Saul A. Kripke, 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen and 'Why the Universe Exists' by New Scientist writers

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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