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  _  __   __   __    ______     ___      ______  
 | |/ //  \ \\/ //  /_____//   / _ \\   /_   _// 
 | ' //    \ ` //   `____ `   / //\ \\    | ||   
 | . \\     | ||    /___//   |  ___  ||  _| ||   
 |_|\_\\    |_||    `__ `    |_||  |_|| /__//    
 `-` --`    `-`'    /_//     `-`   `-`  `--`     
                    `-`

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發送短信 : Algebraic groups and their tangent spaces