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

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Text this: On subgroups of crystallographic Coxeter groups