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补充一个例子，数据

Posted by zxj1015 at 2015-05-07 17:10:28 on Problem 1690 and last updated at 2015-05-07 17:10:40 
6
(A-B + C) - (A+(B - C)) - (C-(D- E) )
  ((A)-( (B)))
A-(B+C)
-(-(A) - (-B))
((H)-((H)+(H)))
(((H)-(H-H))+((H)+(H)))
((H)+(H)+(H))
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