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__    __     ___      ______   _    _     _____   
\ \\ / //   / _ \\   /_____// | || | ||  / ____|| 
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  \  //    | \_/ ||  /___//   | \\_/ || \ \\___   
   \//      \___//   `__ `     \____//   \_____|| 
    `       `---`    /_//       `---`     `----`  
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發送短信 : Galois theory. (2nd ed)