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 __   __    _____     ______   __   __    ______  
 \ \\/ //  |  ___||  /_____//  \ \\/ //  /_   _// 
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  / . \\   | ||__    /___//      | ||     _| ||   
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 `-`  --`  `-----`   /_//        `-`'    `--`     
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Text this: Payment preferences of hawkers in Singapore : a discrete choice experiment