Combining Texts

You have chosen 'What do powers do when they are not manifested?' by Stathis Psillos, 'Proof of an External World' by G.E. Moore and 'The Mirage of Social Justice' by F.A. Hayek

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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