Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'Number Determiners, Numbers, Arithmetic' by Thomas Hofweber and 'Letter to Peter Wilhelm Lund' by Sren Kierkegaard

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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