Combining Texts

You have chosen 'A Slim Book about Narrow Content' by Gabriel M.A. Segal, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'On suicide' by David Hume

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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