A_1,A_2,A_3,\cdots,A_n
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  1. http://formula.s21g.com/?A_1,A_2,A_3,%5Ccdots,A_n
  2. http://formula.s21g.com/
  3. http://blog.s21g.com/?page=7
  4. http://blog.s21g.com/lvs/articles/2012.8.8
  5. http://blog.s21g.com/?page=4