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           __   __   _____     _    _    _    _   
  ____     \ \\/ // |  __ \\  | || | || | || | || 
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 |  __//     |_||   |_____//   \____//   \____//  
 |_|`-`      `-`'    -----`     `---`     `---`   
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Text this: Efficient and robust 3D line drawings using difference-of-Gaussian