Let \( A=\left[\begin{array}{ccc}5 & 5 \alpha & \alpha \\ 0...

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Let \( A=\left[\begin{array}{ccc}5 & 5 \alpha & \alpha \\ 0 & \alpha & 5 \alpha \\ 0 & 0 & 5\end{array}\right] \). If \( \left|A^{2}\right|=25 \), then \( |\alpha| \) equals:
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