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 _    _    __   __               ___     _    _   
| || | ||  \ \\/ //   ____      / _ \\  | \  / || 
| || | ||   \ ` //   |    \\   | / \ || |  \/  || 
| \\_/ ||    | ||    | [] ||   | \_/ || | .  . || 
 \____//     |_||    |  __//    \___//  |_|\/|_|| 
  `---`      `-`'    |_|`-`     `---`   `-`  `-`  
                     `-`

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發送短信 : Two MEWMA charts for gumbel's bivariate exponential distribution