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http://blog.163.com/zmtcumt@126/blog/static/101845747201082955038707/
http://wenku.baidu.com/view/009b97dd5022aaea998f0f28.html
http://zh.wikipedia.org/wiki/Ribbon
http://www.jizhuomi.com/software/253.html
http://www.cnblogs.com/kekec/archive/2011/11/16/2251110.html
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