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

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Text this: On Index 2 Subgroups of Hyperbolic Symmetry Groups