Let \[ f(n) = \left\{ \begin{array}{l l} 4 - n & \quad \text{if $n$} \leq 3\\ f(n-1)+f(n-2)+f(n-3) & \quad \text{if $n$} > 3 \end{array} \right.\]

What are the last 3 digits of \(f(10^{12})\)?

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