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

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發送短信 : On Non-perfect Colorings Arising from Index 4 Subgroups