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

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發送短信 : Connectedness of endo-cayley digraphs of right(left) zero union of semigroups