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

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Text this: Third order nonlinear optical property of Bi2Se3