Combining Texts

You have chosen 'Thinking and Experience' by H.H. Price, 'Mathematics and Philosophy: grand and little' by Alain Badiou and 'A Universe from Nothing' by Lawrence M. Krauss

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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