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   _____    _____                ___     __   __  
  / ___//  |  ___||     ___     / _ \\   \ \\/ // 
  \___ \\  | ||__      /   ||  / //\ \\   \   //  
  /    //  | ||__     | [] || |  ___  ||  / . \\  
 /____//   |_____||    \__ || |_||  |_|| /_//\_\\ 
`-----`    `-----`      -|_|| `-`   `-`  `-`  --` 
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發送短信 : On Laplacian centrality of a graph: An exposition