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  _  _    __   __    _____     _____     ____    
 | \| ||  \ \\/ //  /  ___||  |  ___||  |  _ \\  
 |  ' ||   \ ` //  | // __    | ||__    | |_| || 
 | .  ||    | ||   | \\_\ ||  | ||__    | .  //  
 |_|\_||    |_||    \____//   |_____||  |_|\_\\  
 `-` -`     `-`'     `---`    `-----`   `-` --`

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發送短信 : Students' conceptual and procedural understanding of conic sections through online guided discovery learning