Combining Texts

You have chosen 'Intro to Naming,Necessity and Natural Kinds' by Stephen P. Schwartz, 'Must We Believe in Set Theory?' by George Boolos and 'Darwin's Dangerous Idea' by Daniel C. Dennett

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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