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 _    _     ______    _____      ___              
| || | ||  /_   _//  /  ___||   / _ \\    ____    
| || | ||   -| ||-  | // __    | / \ ||  |    \\  
| \\_/ ||   _| ||_  | \\_\ ||  | \_/ ||  | [] ||  
 \____//   /_____//  \____//    \___//   |  __//  
  `---`    `-----`    `---`     `---`    |_|`-`   
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Text this: The graph relabeling problem and its variants