Combining Texts

You have chosen 'Matter and Memory' by Henri Bergson, 'Does Emp.Knowledge have Foundation?st2=Wilfrid Sellars' by and 'talk' by David Marshall

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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