Combining Texts

You have chosen 'Survival and Identity, with postscript' by David Lewis, 'Is Justified True Belief Knowledge?' by Edmund L. Gettier and 'Philosophy of Revelation' by Friedrich Schelling

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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