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There are two sets X={a,b,c,d}X= \{ a, b, c, d \}X={a,b,c,d} and Y={a,e,i,o,u}Y= \{ a, e, i, o, u \}Y={a,e,i,o,u}. How many of the functions whose domain is XXX and codomain is YYY, are not one-to-one?
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