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

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