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

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發送短信 : Automatic and polynomial-time algebraic structures