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

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發送短信 : A NUMERICAL SOLUTION OF A HELMHOLTZ EQUATION USING BOUNDARY ELEMENTS