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

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發送短信 : Payment preferences of hawkers in Singapore : a discrete choice experiment