texmath-0.6.7: tests/writers/mfenced-06.tex
\left\lbrack \begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right|=\left|\begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right\rbrack \left\lbrack \begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right|=\left|\begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right\rbrack