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

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Text this: On Index 2 Subgroups of Hyperbolic Symmetry Groups