Combining Texts

You have chosen 'Remarks on the definition and nature of mathematics' by Haskell B. Curry, 'The Principles of Human Knowledge' by George Berkeley and 'Remembrance of Things Past' by Marcel Proust

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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