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 \ \\/ // | || | ||     ___    /_   _//  / ____|| 
  \   //  | || | ||    /   ||   -| ||-  / //---`' 
  / . \\  | \\_/ ||   | [] ||   _| ||_  \ \\___   
 /_//\_\\  \____//     \__ ||  /_____//  \_____|| 
 `-`  --`   `---`       -|_||  `-----`    `----`  
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發送短信 : Baire one functions and their sets of discontinuity