Combining Texts

You have chosen 'The Sayings of Confucius' by Confucius, 'Must We Believe in Set Theory?' by George Boolos and 'Rule Utilitarianism and Euthanasia' by Brad W. Hooker

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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