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

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發送短信 : Computer Mathematics