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

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發送短信 : Some Notes on the Total Service Time in Certain Loss Systems