Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'The Artworld' by Arthur C. Danto and 'The Logical Syntax of Language' by Rudolph Carnap

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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