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	#!/usr/bin/env bash

	array=( 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 a in "${array[@]}"
	do
	for b in "${array[@]}"
	do
	for c in "${array[@]}"
	do
	domain="$a$b$c.de"
	echo $domain
	nslookup $domain\|grep NXDOMAIN >> free.txt
	done
	done
	done