Hofstadter: What are the letters 'A' and 'I'?(stanford.edu)
stanford.edu
Hofstadter: What are the letters 'A' and 'I'?
http://www.stanford.edu/group/SHR/4-2/text/hofstadter.html
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http://www.stanford.edu/group/SHR/4-2/text/hofstadter.html
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