The one-liner:
for i in `echo {{a..z},{0..9}};echo {{a..z},{0..9}}{{a..z},{0..9}}`;do dict -d all -C ${i}de>/dev/null 2>&1; if [ "$?" == "0" ];then echo $i.de; fi done
or the equivalent multi-liner:
for i in `echo {{a..z},{0..9}};echo {{a..z},{0..9}}{{a..z},{0..9}}`; do dict -d all -C ${i}de >/dev/null 2>&1; if [ "$?" == "0" ]; then echo $i.de; fi done
No comment (*cough*)
(P.S. That’s for ASCII alphanumeric domains only)