If $\mathrm{A}=\left[\begin{array}{cc}1& 0\\ -1& 7\end{array}\right],\mathrm{I}=\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]\text{ and }{\mathrm{A}}^2=8\mathrm{A}+\mathrm{\alpha I}$, then, the value of $\mathrm{\alpha }$ is

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