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

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Text this: On Index 2 Subgroups of Hyperbolic Symmetry Groups