Combining Texts

You have chosen 'Mathematics without Numbers' by Geoffrey Hellman, 'The Foundations of Empirical Knowledge' by A.J. Ayer and 'The Elm and the Expert' by Jerry A. Fodor

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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