Combining Texts

You have chosen 'Fath and Love, or the King and Queen' by Novalis, 'On Freedom' by Gottfried Leibniz and 'On the Introduction of Transfinite Numbers' by John von Neumann

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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