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 _    _    _    _     _  __     ___              
| \  / || | || | ||  | |/ //   / _ \\    ____    
|  \/  || | || | ||  | ' //   / //\ \\  |    \\  
| .  . || | \\_/ ||  | . \\  |  ___  || | [] ||  
|_|\/|_||  \____//   |_|\_\\ |_||  |_|| |  __//  
`-`  `-`    `---`    `-` --` `-`   `-`  |_|`-`   
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發送短信 : Fast random graph generation