Combining Texts

You have chosen 'Physiologia' by Walter Charleton, 'Modal Realism at Work: Properties' by David Lewis and 'Science and Method' by Henri Poincar

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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