Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Issues of Pragmaticism' by Charles Sanders Peirce and 'Remarks on the forces of inorganic Nature' by J.R. Mayer

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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