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|  __ \\   |  ___||   ____     \ \\/ // \ \\ / // 
| |  \ ||  | ||__    |    \\    \ ` //   \ \/ //  
| |__/ ||  | ||__    | [] ||     | ||     \  //   
|_____//   |_____||  |  __//     |_||      \//    
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發送短信 : Quantitative determination of stone fragmentation efficiency