Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'On boundary numbers and domains of sets' by Ernst Zermelo and 'Reflections on Value' by Simone Weil

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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