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

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發送短信 : Advanced Mathematics