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$$m = 5,n = 5,s = 5$$$$\left(\begin{array}{cccccc}7&8&8&6&7&\\
1&5&0&3&1&\\
9&4&4&2&7&\\
2&6&5&7&3&\\
9&5&7&0&7&\\
\end{array}\right)\left(\begin{array}{cccccc}2&5&7&0&8&\\
4&9&8&3&5&\\
6&6&0&8&2&\\
1&9&6&5&2&\\
6&9&0&1&6&\\
\end{array}\right)
= \left(\begin{array}{cccccc}142&272&149&125&166&\\
31&86&65&31&45&\\
102&186&107&61&146&\\
83&184&104&96&88&\\
122&195&103&78&153&\\
\end{array}\right)$$
\end{document}
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