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  / ___//  /_   _//  | |/ //   / _ \\  |      \\ 
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 /____//   /_____//  |_|\_\\ |_||  |_|||______// 
`-----`    `-----`   `-` --` `-`   `-` `------`

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發送短信 : Pricing Information Goods: A Strategic Analysis of the Selling and Pay-per-Use Mechanisms