This is TeX, WAITS Version 2.1 (preloaded format=plain 87.2.17)  22 APR 1987 01:00
**ANS.TEX
(ANS.TEX[TEX,DEK]
! Undefined control sequence.
<recently read> How did this happen?
                                    
l.3 \answer
           
? 
! Undefined control sequence.
<recently read> How did this happen?
                                    
l.6 \answer
           
? 
! Undefined control sequence.
<recently read> How did this happen? 
                                     
l.10 \answer
            
? 
)
*\tracingall
{horizontal mode: Htracingstats}
{Htracingpages}
{Htracingoutput}
{Htracinglostchars}
{Htracingmacros}
{Htracingparagraphs}
{Htracingrestores}
{Hshowboxbreadth}
{Hshowboxdepth}
{Herrorstopmode}


*\bye

Hbye ->Hpar Hvfill Hsupereject Hend 
{Hpar}
@firstpass
[]Htenrm How did this happen How did this happen 
@Hpar via @@0 b=0 p=-10000 d=100
@@1: line 1.2- t=100 -> @@0

%% goal height=643.20255, max depth=4.0
{vertical mode: Hvfill}

Hsupereject ->Hpar Hpenalty -H@MM 
{Hpar}
% t=10.0 g=643.20255 b=10000 p=0 c=100000#
{Hpenalty}
% t=11.94444 plus 1.0fill g=643.20255 b=0 p=-20000 c=-20000#
Houtput->{Hplainoutput }

Hplainoutput ->Hshipout Hvbox {Hmakeheadline Hpagebody Hmakefootline }Hadvancepa
geno Hifnum Houtputpenalty >-H@MM Helse Hdosupereject Hfi 
{internal vertical mode: Hshipout}

Hmakeheadline ->Hvbox toHz@ {Hvskip -22.5Hp@ Hline {Hvbox to8.5Hp@ {}Hthe Hheadl
ine }Hvss }Hnointerlineskip 
{Hvbox}
{Hvskip}

Hline ->Hhbox toHhsize 
{Hhbox}
{restricted horizontal mode: Hvbox}
{internal vertical mode: end-group character }}
{restricted horizontal mode: Hthe}
{Hhfil}
{end-group character }}