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| || | ||   / _ \\  | \  / || | || | ||   / ___// 
| '--' ||  | / \ || |  \/  || | || | ||   \___ \\ 
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|_|| |_||   \___//  |_|\/|_||  \____//   /____//  
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發送短信 : Evaluation of the impact of E-procurement on buyers and suppliers in a value chain