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 _    _     ______     _____     ___      ______  
| \  / ||  /_   _//   / ___//   / _ \\   /_   _// 
|  \/  ||   -| ||-    \___ \\  / //\ \\    | ||   
| .  . ||   _| ||_    /    // |  ___  ||  _| ||   
|_|\/|_||  /_____//  /____//  |_||  |_|| /__//    
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發送短信 : Requirements analysis of presence: Insights from a RPG game