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

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發送短信 : Note on existence of nonnegative solutions to singular semi-positone problems