AB=BA
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Recent Referers:
  1. http://formula.s21g.com/?AB%3DBA
  2. https://formula.s21g.com/formulae/35493
  3. https://formula.s21g.com/?AB%3DBA
  4. https://blog.s21g.com/
  5. http://blog.s21g.com/articles/2013.12