Combining Texts

You have chosen 'The Philosophy of Logic' by Hilary Putnam, 'The Value of Knowledge and the Pursuit of Understanding' by Jonathan Kvanvig and 'Many, but almost one' 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