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

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Text this: Closed left-r.e. sets