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1 | 3 | 5 | 9 |
1 | 3 | 1 | 7 |
4 | 3 | 9 | 7 |
5 | 2 | 0 | 9 |
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\begin{pmatrix}1 & 5 & -1 \\11 & 3 & 4 \\1 & -1 & 3\end{pmatrix}+\begin{pmatrix}7 & 2 & 9 \\1 & 2 & 5 \\0 & 2 & 4\end{pmatrix}
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