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1. |
\begin{array}{|c|c|c|c|}\hline 1 & {2} & {1} & {{ } \\ \hline 1 & {9} & {4} & {0} & {0} \\ \hline & {{ } & {3} & {6} & {0} \\ \hline & {5} & {4} & {0} \\ \hline & {8} & {0} & {0} \\ \hline & {{ } & {4} & {5} \\ \hline\end{array} |
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