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

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發送短信 : A time-dependent busy period queue length formula for the M/Ek/1 queue