Combining Texts

You have chosen 'Matter and Memory' by Henri Bergson, 'Our Knowledge of the External World' by Bertrand Russell 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