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Danxiashan yinyuandan. User: Zhuwq (2005-01-31) Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.