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

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發送短信 : The Set Chromatic Numbers of the Middle Graph of Tree Families