發送短信 : Partially composed property of generalized lexicographic product graphs

  ______   __   __  __    __   _    _    __   _   
 /_   _//  \ \\/ // \ \\ / // | || | || | || | || 
 `-| |,-    \ ` //   \ \/ //  | || | || | '--' || 
   | ||      | ||     \  //   | \\_/ || | .--. || 
   |_||      |_||      \//     \____//  |_|| |_|| 
   `-`'      `-`'       `       `---`   `-`  `-`