.nr _0 \n(c.
.de ac
.nr hm 0
.nr tm 0
.rm $h
.ll 8.9i
.pl 15i
.nr $s 0.5i
.if !\\n($T \
.	po 1.0i
.nr bm 3i
.nr fm 0.9i
.de $f ..
.ti 0
\h'|0.5i'\\\\n%\h'|1.25i'\\$2\h'|3i'\\$1
.br
...
.bp
.rs
.sp 0.75i
.rm ac
..
.if t .tm Line \n(c. -- macro .ac will not work in TROFF -- request ignored.
.if t .rm ac
.de +c			\" *** begin chapter
.if \\n(?A \
\{\
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.sp 1i
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..
.nr c. \n(_0