xref

#!/bin/csh
#produce a nice listing of "incidence"
#add  printcobasis and incidence options to end of input file
# % lrs input output
# % xref output

grep represent $1 >! $1.x
perl -nle 'print $1 if /s (.+?)I/' $1 |sed 's/ ://'|sed 's/[^ ]*\* //' | sed 's/$/   #/'| nl >> $1.x