% This file does nothing useful but it displays TEX's inner workings
\input basic
\trace'77777717 % everything except pauses
\chpar4=104 % widow line penalty
\chpar5=105 % broken line penalty
\chpar6=106 % binop break
\chpar7=107 % relation break
\chpar9=109 % display break

\hsize 201pt
\vsize 202pt
\parindent 2.03pt
\mathsurround 2.04pt
\topbaseline 100pt
\maxdepth 4.987654321pt

\baselineskip 12pt plus .301pt minus .401pt
\lineskip 1pt plus .302pt minus .402pt
\parskip 0pt plus .303pt minus .403pt
\dispskip 12pt plus .304pt minus .404pt
\dispaskip 3pt plus .305pt minus .405pt
\dispbskip 9pt plus .306pt minus .406pt
\topskip 3pt plus .307pt minus .407pt
\botskip 3pt plus .308pt minus .408pt
\tabskip 0pt plus .309pt minus .409pt
\parfillskip 10pt plus 3.10pt minus 4.10pt
\xspaceskip 5pt plus .311pt minus .411pt

\topsep{\hbox{T}}
\botsep{\hbox{B}}

\hangindent 100pt
sil{\sl \'ly\/} ker\-n-\lower 20pt\vbox to 30pt{}\topinsert{\hbox{A}},
$b+c=d$. \vrule height -.3pt \leaders\hrule\hfil
\send 0{help}\linebreak
\hbox{pleas?} \pagebreak\ddt
$$\int\limitswitch↓R\sqrt{a\over
	\hbox{x}+\dispstyle b↑{\gamma↑\prime↓3}\ast{1\choose2}\ddt}$$

\mark{twain}
\halign{y#\hss⊗#\tabskip 0pt minus .666pt\cr
1⊗2\cr
34\cr
\noalign{\hrule\ddt}
\leaders\hbox{!}\cr}
\botinsert{\moveleft 13pt\hbox{\lower10pt\null}}
\vfill\end