$ORIGIN mix2.
@		1	IN SOA	ns hostmaster (
				1        ; serial
				3600
				1800
				1814400
				3
				)
; this needs #2390
;			NS	ns
			NS	ns.mix2.
ns			A	10.53.0.1
a			TXT	"inherited ttl 1"
$INCLUDE mix2sub1.txt
b			TXT	"explicit ttl 6"
c		2	TXT	"inherited ttl 2"
m           TXT "explicit ttl 6"
$TTL 3
d			TXT	"default ttl 3"
e		2	TXT	"explicit ttl 2"
n           TXT "default ttl 3"
$INCLUDE mix2sub2.txt
f			TXT	"default ttl 5"