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

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發送短信 : Sharpening mean - form and cyclic inequality