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

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Text this: Symmetry groups of single-wall nanotubes