Simplify $\sqrt{2^{\left(9^{\left(4^{- 2^{-1}}\right)}\right)}}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $9^{\left(4^{- 2^{-1}}\right)}$ and $n$ equals $\frac{1}{2}$
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