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  _____    _    _              __   __   _    _   
 /  ___|| | || | ||     ___    \ \\/ // | || | || 
| // __   | || | ||    /   ||   \ ` //  | || | || 
| \\_\ || | \\_/ ||   | [] ||    | ||   | \\_/ || 
 \____//   \____//     \__ ||    |_||    \____//  
  `---`     `---`       -|_||    `-`'     `---`   
                         `-`

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發送短信 : Design of non-linear mathematical function