\voffset=-1in \topmargin=20mm \headheight=0mm \headsep=0mm
\textheight=\paperheight \advance\textheight by -2\topmargin
-\newdimen\titlewidth \titlewidth=0.5\textwidth \advance\titlewidth by -40pt
+\newdimen\titlewidth
\pagestyle{empty}
\errorcontextlines=50
\def\fulltrack{full}
\namelet{dflt/empty}\relax
-\namedef{dflt/full}{\hfil\vrule\hfil}
+\namelet{dflt/full}\vrule
\namelet{dots/empty}\strut
\namedef{dots/full}{\strut\raisebox{-2pt}{\smash{{$\vdots$}}}}
}
\edef\oldoutput{\the\output}
-%\output={\showbox255 \oldoutput}
+%%\output={\showbox255 \oldoutput}
\begin{document}
\lineskip=0pt
\footnotesize
+\titlewidth=0.5\textwidth \advance\titlewidth by -4em
+
\global\def\\{&&&&&\cr}
\halign%
{\strut\hbox to \titlewidth{\qquad\ignorespaces#\unskip\hfil}%