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

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發送短信 : Soaring 21st century mathematics: Business math