Combining Texts

You have chosen 'Inquiry Concerning Virtue or Merit' by 3rd Earl of Shaftesbury, 'A world of truthmakers?' by David Lewis and 'Set Theory and its Logic' by Willard Quine

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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