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

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發送短信 : Low-rank mechanism : optimizing batch queries under differential privacy