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

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Text this: Third order nonlinear optical property of Bi2Se3