Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'What Does It Take to Refer?' by Kent Bach and 'Presentism and Properties' by John Bigelow

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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