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

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發送短信 : On extriangles and excevians