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

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發送短信 : Cupping and jump classes in the computably enumerable degrees