Combining Texts

You have chosen 'On the Nature of Mathematical Reasoning' by Henri Poincar��, 'Should a materialist believe in qualia?' by David Lewis and 'The Extended Mind' by A Clark / D Chalmers

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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