أرسل هذا في رسالة قصيرة: Sigma Chromatic Number of the Middle Graph of Some General Families of Trees of Height 2

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