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 / ____||  \ \\/ //   ____    | || | ||  /_____// 
/ //---`'   \ ` //   |    \\  | || | ||  `____ `  
\ \\___      | ||    | [] ||  | \\_/ ||  /___//   
 \_____||    |_||    |  __//   \____//   `__ `    
  `----`     `-`'    |_|`-`     `---`    /_//     
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發送短信 : Solution of stiff two point boundary value problems using deferred correction scheme