#/bin/csh -f
set tr=/usr/bin/tr 
if ($#argv == 1) then
	$tr -cs  'A-Za-z' '\012' < $1 | sort | uniq | comm -23 - /usr/dict/words
else
	$tr -cs  'A-Za-z' '\012'  | sort | uniq | comm -23 - /usr/dict/words
endif