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Which set of ordered pairs does not represent a function?
○ {(0, 6), (9,-3), (0,9), (6,-5)}
O{(-7,0), (7,0), (-2,-8), (-8,-1)}
O {(7,-6), (-7, -1), (-8, 0), (3,0)}
O {(2,0), (7,6), (-5, 6), (1, -7)}