Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'There Are No Abstract Objects' by Cian Dorr and 'The Tragic Sense of Life' by Miguel de Unamuno

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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