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

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Text this: Extracting key-substring-group features for text classification