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

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發送短信 : Cryptology and Network Security