Easy
Select the relation that represent a function.
(0,5),(0,9),(6,2),(9,2),(15,2){(0,5),(0,9),(6,2),(9,2),(15,2)}(0,5),(0,9),(6,2),(9,2),(15,2)
(0,10),(4,7),(5,5),(7,4),(7,8){(0,10),(4,7),(5,5),(7,4),(7,8)}(0,10),(4,7),(5,5),(7,4),(7,8)
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