Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Can Mechanisms Replace Laws of Nature?' by Bert Leuridan and 'Explanation and Reference' by Hilary Putnam

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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