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

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發送短信 : Các kỹ thuật SAT Solving