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

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發送短信 : Modeling a stacking yard transportation system