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 __   _     _____    _    _     _____    _    _   
| || | ||  |  ___|| | \  / ||  |  ___|| | |  | || 
| '--' ||  | ||__   |  \/  ||  | ||__   | |/\| || 
| .--. ||  | ||__   | .  . ||  | ||__   |  /\  || 
|_|| |_||  |_____|| |_|\/|_||  |_____|| |_// \_|| 
`-`  `-`   `-----`  `-`  `-`   `-----`  `-`   `-`

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發送短信 : On the energy of closed shadow graphs