發送短信 : Ordinal optimization with subset selection rule

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