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

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發送短信 : Non-chordal graphs having integral-root chromatic polynomials II