\input amstex
\input mathdots

\eightpoint
eightpoint
$\ddots^{\ddots^{\ddots}}$ $\iddots^{\iddots^{\iddots}}$
$\vdots^{\vdots^{\vdots}}$

$\dot{X}$
$\ddot{X}$
$\dddot{X}$
$\ddddot{X}$
$X^{\dot{X}}$
$X^{\ddot{X}}$
$X^{\dddot{X}}$
$X^{\ddddot{X}}$
$X^{X^{\dot{X}}}$
$X^{X^{\ddot{X}}}$
$X^{X^{\dddot{X}}}$
$X^{X^{\ddddot{X}}}$

\smallskip
\hrule
\smallskip
\ninepoint
ninepoint
$\ddots^{\ddots^{\ddots}}$ $\iddots^{\iddots^{\iddots}}$
$\vdots^{\vdots^{\vdots}}$

$\dot{X}$
$\ddot{X}$
$\dddot{X}$
$\ddddot{X}$
$X^{\dot{X}}$
$X^{\ddot{X}}$
$X^{\dddot{X}}$
$X^{\ddddot{X}}$
$X^{X^{\dot{X}}}$
$X^{X^{\ddot{X}}}$
$X^{X^{\dddot{X}}}$
$X^{X^{\ddddot{X}}}$

\smallskip
\hrule
\smallskip
\tenpoint
tenpoint
$\ddots^{\ddots^{\ddots}}$ $\iddots^{\iddots^{\iddots}}$
$\vdots^{\vdots^{\vdots}}$

$\dot{X}$
$\ddot{X}$
$\dddot{X}$
$\ddddot{X}$
$X^{\dot{X}}$
$X^{\ddot{X}}$
$X^{\dddot{X}}$
$X^{\ddddot{X}}$
$X^{X^{\dot{X}}}$
$X^{X^{\ddot{X}}}$
$X^{X^{\dddot{X}}}$
$X^{X^{\ddddot{X}}}$

\smallskip
\hrule
\smallskip
\twelvepoint
twelvepoint
$\ddots^{\ddots^{\ddots}}$ $\iddots^{\iddots^{\iddots}}$
$\vdots^{\vdots^{\vdots}}$

$\dot{X}$
$\ddot{X}$
$\dddot{X}$
$\ddddot{X}$
$X^{\dot{X}}$
$X^{\ddot{X}}$
$X^{\dddot{X}}$
$X^{\ddddot{X}}$
$X^{X^{\dot{X}}}$
$X^{X^{\ddot{X}}}$
$X^{X^{\dddot{X}}}$
$X^{X^{\ddddot{X}}}$

\smallskip
\hrule
\smallskip
\enddocument\end