1.

\begin{array}{l}{\text { Simplify: }} \\ {\left(\frac{X^{4}}{X^{b}}\right)^{a-b}\left(\frac{X^{b}}{X^{-c}}\right)^{b-c}\left(\frac{X^{c}}{X^{-u}}\right)^{c-a}}\end{array}

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