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

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發送短信 : Dynamic inventory rationing for systems with multiple demand classes