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

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Text this: On subgroups of crystallographic Coxeter groups