#!/bin/bash
a=(a b c d e f g h i j k l m n o p q r s t u v w x y z);
for b in ${a[*]}; do
	for c in ${a[*]}; do
		for d in ${a[*]}; do
			for e in ${a[*]}; do
				echo -ne "$b$c$d$e.org\r" > /dev/stderr
				if ! host $b$c$d$e.org > /dev/null; then
					echo $b$c$d$e.org
				fi
			done
		done
	done
done
