Combining Texts

You have chosen 'Introduction to Mathematical Logic' by Michal Walicki, 'The Boundary Stones of Thought' by Ian Rumfitt and 'A Serious Proposal to the Ladies I' by Mary Astell

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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