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

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發送短信 : Sigma chromatic numbers of the middle graph of some families of graphs