\left(\begin{array}{ccc}
1 & 2 & 3 \\
2 & 1 & 3
\end{array}\right)
\left(\begin{array}{ccc}
1 & 2 & 3 \\
1 & 3 & 2
\end{array}\right)=\left(\begin{array}{ccc}
1 & 2 & 3 \\
2 & 3 & 1
\end{array}\right)