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

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發送短信 : Summarizing user-item matrix by group utility maximization