Combining Texts

You have chosen 'Letters to Antoine Arnauld' by Gottfried Leibniz, 'Intention, Plans, and Practical Reason' by Michael Bratman and 'Lewis on Perdurance versus Endurance' by E.J. Lowe

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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