Combining Texts

You have chosen 'Writing the Book of the World' by Theodore Sider, 'A Slim Book about Narrow Content' by Gabriel M.A. Segal and 'Process and Reality' by Alfred North Whitehead

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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