Combining Texts

You have chosen 'What is so bad about Contradictions?' by Graham Priest, 'works' by Naguib Mahfouz and 'Theory Change and the Indeterminacy of Reference' by Hartry Field

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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