texmath-0.9.4: tests/writers/msqrt-03.eqn
sqrt {matrix{
ccol{ {hphantom A} above {hphantom A} }
ccol{ {hphantom A} above {hphantom A} }
ccol{ {hphantom A} above {hphantom A} }
ccol{ {hphantom A} above {hphantom A} }
ccol{ {hphantom A} above {hphantom A} }
ccol{ {hphantom A} above {hphantom A} }
}}