Combining Texts

You have chosen 'Oldest System Prog. of German Idealism' by Georg W.F.Hegel, 'New System and Explanation of New System' by Gottfried Leibniz and 'Number Determiners, Numbers, Arithmetic' by Thomas Hofweber

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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