The function f(x)f(x)f(x) satisfies f(x+y)=f(x)+f(y)+3xyf(x+y) = f(x) + f(y) + 3xyf(x+y)=f(x)+f(y)+3xy. Given f(1)=4f(1) = 4f(1)=4, determine f(2)f(2)f(2).
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