A polynomial f(x)f(x)f(x) of degree 3 satisfies f(1)=3,f(2)=5,f(3)=9,f(4)=15f(1)=3, f(2)=5, f(3)=9, f(4)=15f(1)=3,f(2)=5,f(3)=9,f(4)=15. Find f(5)f(5)f(5).
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