Combining Texts

You have chosen 'The Relation of Sense-Data to Physics' by Bertrand Russell, 'Letters to Coste' by Gottfried Leibniz and 'Farewell to Reality: fairytale physics' by Jim Baggott

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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