Combining Texts

You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Counterparts and Identity' by Robert C. Stalnaker and 'On 'Generation and Corruption'' by Giles of Orleans

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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