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Consider the following pattern:
51=552=2553=12554=625 \begin{array} {l r} \\ 5 ^ 1 = & 5 \\ 5^2 = & 25 \\ 5^3 = & 125 \\ 5^4 = & 625 \\ \end{array} 51=52=53=54=525125625
What is the units digit of 525 5^{25} 525?
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