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

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發送短信 : Closed left-r.e. sets