Combining Texts

You have chosen 'New system of communication of substances' by Gottfried Leibniz, 'On 'Insolubilia' and their solution' by Bertrand Russell and 'On Mental Entities' 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