Combining Texts

You have chosen 'A Dictionary of Political Thought' by Roger Scruton, 'A World of Propensities' by Karl Popper and 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero

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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