Combining Texts

You have chosen 'On the Question of Absolute Undecidability' by Peter Koellner, 'The New Institutional Theory of Art' by George Dickie and 'An Axiomatization of Set Theory' by John von Neumann

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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