Combining Texts

You have chosen 'Counterfactual Dependence and Time's Arrow' by David Lewis, 'An Analysis of Knowledge and Valuation' by C.I. Lewis and 'Sources of the Self' by Charles Taylor

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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