If f(n)=f(n−1)+f(n−2)f(n) = f(n-1) + f(n-2)f(n)=f(n−1)+f(n−2) with f(1)=1,f(2)=2f(1)=1, f(2)=2f(1)=1,f(2)=2, what is f(4)f(4)f(4)?
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