Natalie tried to evaluate an expression step by step.
$\begin{align}
&\left( 4^{-3} \cdot 2^{-3} \right)^{0}
\\\\
=&\left( 8^{-3}\right)^{0} &\green{\text{Step } 1}
\\\\
=& 8^{0} &\blue{\text{Step } 2}
\\\\
=&0&\purple{\text{Step } 3}
\end{align}$
**Find Natalie's mistake.**
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