4=3+1=2+2=2+1+1=1+1+1+1
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Recent Referers:
  1. http://formula.s21g.com/?4%3D3+1%3D2+2%3D2+1+1%3D1+1+1+1
  2. http://blog.s21g.com/articles/2301
  3. http://formula.s21g.com/
  4. http://blog.s21g.com/articles/2012.9
  5. http://t.co/vp5cjh6R0n