Combining Texts

You have chosen 'Physics and Philosophy' by Werner Heisenberg, 'The Actual and the Virtual' by Gilles Deleuze and 'The Book of Chuang Tzu' by Zhuangzi (Chuang Tzu)

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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