PREUN

/bin/sh

if [[ "$1" = "0" ]]; then
  perl -ni -e "/^THES\s*it\s*IT\s*th_it_IT$/ or print" /usr/share/dict/ooo/dictionary.lst
fi

POSTIN

/bin/sh

if [[ ! -f "/usr/share/dict/ooo/dictionary.lst" ]] ||       ! grep -q "^THES[ \t]*it[ \t]*IT[ \t]*th_it_IT" /usr/share/dict/ooo/dictionary.lst
then
  echo "THES it IT th_it_IT" >> /usr/share/dict/ooo/dictionary.lst
fi