Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'Philosophy of Mathematics' by Leon Horsten and 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer

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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