發送短信 : A model of fair process and its limits

  ______     ___     _____       ___              
 /_   _//   / _ \\  |  __ \\    / _ \\      ___   
   | ||    / //\ \\ | |  \ ||  / //\ \\    /   || 
  _| ||   |  ___  ||| |__/ || |  ___  ||  | [] || 
 /__//    |_||  |_|||_____//  |_||  |_||   \__ || 
 `--`     `-`   `-`  -----`   `-`   `-`     -|_|| 
                                             `-`