Combining Texts

You have chosen 'Three Varieties of Knowledge' by Donald Davidson, 'What do powers do when they are not manifested?' by Stathis Psillos and 'Philosophy of Mathematics' by Stewart Shapiro

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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