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\left. \begin{array} { | c | c | } \hline 5 & { 1 } & { 25 } \\ \hline 6 & { 2 } & { 18 } \\ \hline 10 & { 4 } & { 25 } \\ \hline 3 & { 3 } & { ? } \\ \hline \end{array} \right.

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