texmath-0.6.7: tests/writers/mfenced-04.tex
\left\lceil \begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right\rfloor =\left\lfloor \begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right\rceil \left\lceil \begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right\rfloor =\left\lfloor \begin{array}{c}
\mathrm{U} \\
\mathrm{V} \\
\end{array}\right\rceil