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Text this: On subgroups of crystallographic Coxeter groups

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  ______    _____               ______    ______  
 /_   _//  |  ___||   ____     /_   _//  /_   _// 
   | ||    | ||__    |    \\    -| ||-   `-| |,-  
  _| ||    | ||__    | [] ||    _| ||_     | ||   
 /__//     |_____||  |  __//   /_____//    |_||   
 `--`      `-----`   |_|`-`    `-----`     `-`'   
                     `-`

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