Which of the following sets of ordered pairs is not a function?

a.
{(3, 2) (4, 2) (3, 7)}

b.
{(8, 6) (6, 1) (‒1, ‒1)}

c.
{(2, ‒7) (3, ‒7) (4, ‒7)}

d.
{(‒5, 8) (3, -8) (‒8, 3)}

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