Combining Texts

You have chosen 'Causation and Laws of Nature' by Jonathan Schaffer, 'Rules for the Direction of the Mind' by Ren Descartes and 'The Trouble with Being Born' by E.M. Cioran

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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