Combining Texts

You have chosen 'Action, Intention and Reason' by Robert Audi, 'The Trouble with Possible Worlds' by William Lycan and 'Ancient Thought in Modern Physics' by Werner Heisenberg

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories