Combining Texts

You have chosen 'works' by Aristotle, 'Deriving Kripkean Claims with Abstract Objects' by Edward N. Zalta and 'The Concept of Truth for Formalized Languages' by Alfred Tarski

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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