發送短信 : Twin chromatic indices of some graphs with maximum degree 3

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