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

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Text this: On subgroups of crystallographic Coxeter groups