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

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發送短信 : Hand-drawn graph sketch matching for e-learning mathematics