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

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發送短信 : On the semigroup whose elements are subgraphs of a complete graph