Combining Texts

You have chosen 'Lectures on the History of Philosophy' by Georg W.F.Hegel, 'Making Things Happen' by James Woodward and 'What are Sets and What are they For?' by Oliver,A/Smiley,T

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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