<|system|>
Simplify $\left( \frac{1}{2k} \right)^{-2} \cdot (-k)^3$.</s>.
<|user|>
Can you answer based on context?
<|assistant|>
$\left( \frac{1}{2k} \right)^{-2} \cdot (-k)^3 = (2k)^2 \cdot (-k)^3 = 4k^2 \cdot (-k^3) = -4k^5$.