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

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發送短信 : Closed left-r.e. sets