Combining Texts

You have chosen 'Wittgenstein on Rules and Private Language' by Saul A. Kripke, 'Political Philosophy (3rd ed)' by Adam Swift and 'An Argument for the Identity Theory' by David Lewis

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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