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

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發送短信 : Optimal contract selection for the global supply and distribution of raw materials