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A gift that keeps on giving December 21, 2014

Posted by Ezra Resnick in Computer science.
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  • Prepare 5 blank papers, and number them (#1 to #5).
  • On paper #1, write: “Prepare 5 blank papers, and number them (#1 to #5).
  • On paper #2, write: “Start a fresh page, and copy the contents of paper #1 onto it.
  • On paper #3, write: “Then, for each of the numbers 1 through 5, write on the fresh page:”, followed by quotation marks, followed by “On paper #X, write:”, followed by quotation marks, followed by “, followed by quotation marks, followed by the contents of paper #X, followed by quotation marks (where X is replaced first by 1, then by 2, etc. — five lines in total).
  • On paper #4, write: “Then copy the contents of papers #2, #3, #4, and #5 onto the fresh page.
  • On paper #5, write: “Give the page to a friend.
  • Start a fresh page, and copy the contents of paper #1 onto it.
  • Then, for each of the numbers 1 through 5, write on the fresh page: “On paper #X, write:”, followed by quotation marks, followed by the contents of paper #X, followed by quotation marks (where X is replaced first by 1, then by 2, etc. — five lines in total).
  • Then copy the contents of papers #2, #3, #4, and #5 onto the fresh page.
  • Give the page to a friend.
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