Combining Texts

You have chosen 'The Scope and Language of Science' by Willard Quine, 'The Logical Form of Action Sentences' by Donald Davidson and 'On Relations of Universals and Particulars' by Bertrand Russell

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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