Combining Texts

You have chosen 'Difference and Repetition' by Gilles Deleuze, 'An Argument for the Identity Theory' by David Lewis and 'The Principles of Human Knowledge' by George Berkeley

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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