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

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