4.4BSD/usr/src/contrib/bind-4.9/contrib/dnsparse/test.db

$ORIGIN ogc.edu
cse	 IN	A	129.95.40.1
	 IN	A	129.95.40.2
	 IN	A	129.95.40.3
ogccse	 IN	CNAME	cse
ogcvax	 IN	CNAME	cse
cse-2	 IN	A	129.95.40.2
	 IN	A	129.95.40.2	; duplicate
ogccse-2 IN	CNAME	cse-2
cse-3	 IN	A	129.95.40.3
ogccse-3 IN	CNAME	cse-3