Contribute correction: Graph Master

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