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  ____      ______              ______    ______  
 |  _ \\   /_   _//   ____     /_   _//  /_   _// 
 | |_| ||   -| ||-   |    \\    -| ||-     | ||   
 | .  //    _| ||_   | [] ||    _| ||_    _| ||   
 |_|\_\\   /_____//  |  __//   /_____//  /__//    
 `-` --`   `-----`   |_|`-`    `-----`   `--`     
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發送短信 : Intergenerational Earnings Mobility in Singapore and the United States