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  ____      ______   _    _      ___      _____   
 |  _ \\   /_   _// | |  | ||   / _ \\   /  ___|| 
 | |_| ||   -| ||-  | |/\| ||  / //\ \\ | // __   
 | .  //    _| ||_  |  /\  || |  ___  ||| \\_\ || 
 |_|\_\\   /_____// |_// \_|| |_||  |_|| \____//  
 `-` --`   `-----`  `-`   `-` `-`   `-`   `---`

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發送短信 : Recursive Linear Bounds for the Vertex Chromatic Number of the Pancake Graph