Combining Texts

You have chosen 'A Combinatorial Theory of Possibility' by David M. Armstrong, 'The Tragic Sense of Life' by Miguel de Unamuno and 'Sententia on 'De Caelo'' by Thomas Aquinas

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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