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

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發送短信 : Advanced Mathematics