Contribute correction: Graph Master

 _    _      ___               _    _   
| |  | ||   / _ \\    ____    | || | || 
| |/\| ||  | / \ ||  |    \\  | || | || 
|  /\  ||  | \_/ ||  | [] ||  | \\_/ || 
|_// \_||   \___//   |  __//   \____//  
`-`   `-`   `---`    |_|`-`     `---`   
                     `-`