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  ______     ___     __   __     ___     _    _   
 /_____//   / _ \\   \ \\/ //   / _ \\  | |  | || 
 `____ `   / //\ \\   \   //   | / \ || | |/\| || 
 /___//   |  ___  ||  / . \\   | \_/ || |  /\  || 
 `__ `    |_||  |_|| /_//\_\\   \___//  |_// \_|| 
 /_//     `-`   `-`  `-`  --`   `---`   `-`   `-` 
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發送短信 : On the Vertex Identification Spectra of Grids