發送短信 : Obtaining splits from cut sets of tight spans

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