Combining Texts

You have chosen 'On the Moral and Legal State of Abortion' by Mary Anne Warren, 'Proper Names' by John Searle and 'Substance and Essence in Aristotle' by Charlotte Witt

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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