.bp 
.au "TSC \- intro.xx"

.c
The Dupwords Program

.2
\f(BIdupwords\fB is a short but not simple program.  
It's really more for document checking than for systems 
administration.  But that's ok: you have to send out mail messages,
and it's nice to catch their typos.  

.2
The way that that works is to read in the entire file and do the pattern
match.  That way it finds mistakes that cross words boundaries.
.b
.b
The way [* that that *] works is ...
.e

.2
The technique for setting markers using 8-bit chars is useful
in many applications, but only works for 7-bit \s-1ASCII\s0.