Combining Texts

You have chosen 'The Universe as We Find It' by John Heil, 'Answer to 'What is Enlightenment?'' by Immanuel Kant and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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