本文档的版权归作者 Jean-Daniel Dodin 所有，并遵循以下许可协议。
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".
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