Which set of ordered pairs does not represent a function?
o {(8,1),(-1,-1), (7,1),(4,9)}
o {(0,-4), (0, -3), (-3,-1), (5,7)}
o{(-6,-5), (-8,-1), (2,3), (3,-5)}
o{(-5,0), (2,-8), (4,0),(-6,-5)}
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