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<!-- MATH
 \begin{equation}
\left( \begin{array}{c}
                          u_1 \\u_2
                        \end{array} \right) =
                 \left( \begin{array}{rr} 1 & 0 \\
                                          0 & 1
                         \end{array} \right)
                 \left( \begin{array}{c} v_1 \\v_2
                 \end{array} \right)
\end{equation}
 -->
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