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| || | ||  |  ___|| |  __ \\   \ \\/ //     ___   
| '--' ||  | ||__   | |  \ ||   \ ` //     /   || 
| .--. ||  | ||__   | |__/ ||    | ||     | [] || 
|_|| |_||  |_____|| |_____//     |_||      \__ || 
`-`  `-`   `-----`   -----`      `-`'       -|_|| 
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發送短信 : Some basic properties of Hadamard groups