Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Lewis on Perdurance versus Endurance' by E.J. Lowe and 'On 'Physics'' by Albert of Saxony

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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