Combining Texts

You have chosen 'Aristotle and Descartes on Matter' by Gottfried Leibniz, 'Set Theory and its Logic' by Willard Quine and 'Commentary on 'Posterior Analytics'' by Robert Grosseteste

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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