texmath-0.6.7: tests/writers/mover9.tex
\overset{\ddddot{} }{{x}} \neq \overset{\ddddot{} }{{x}}=\overset{\ddddot{} }{{x}}=\overset{\ddddot{} }{{x}}\overset{\ddddot{} }{{x}} \neq \overset{\ddddot{} }{{x}}=\overset{\ddddot{} }{{x}}=\overset{\ddddot{} }{{x}}