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$[\begin{array}{c} 3 & 2 & 1 \\ 1 & 2 & 3 \\ 2 & 3 & 1 \end{array}]$

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Transpose the matrix by switching its rows to columns.

$[\begin{array}{c} 3 & 1 & 2 \\ 2 & 2 & 3 \\ 1 & 3 & 1 \end{array}]$