Combining Texts

You have chosen 'Semantics for Propositional Attitudes' by Jaakko Hintikka, 'Idealism: a critical survey' by A.C. Ewing and 'Mathematical Thought from Ancient to Modern Times' by Morris Kline

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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