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

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