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  _  _    __   __   _    _    _    _    ______   
 | \| ||  \ \\/ // | || | || | || | || |      \\ 
 |  ' ||   \ ` //  | || | || | || | || |  --  // 
 | .  ||    | ||   | \\_/ || | \\_/ || |  --  \\ 
 |_|\_||    |_||    \____//   \____//  |______// 
 `-` -`     `-`'     `---`     `---`   `------`

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發送短信 : Modeling student task persistence in a learning-by-teaching environment