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  1. or download this
    #!/usr/local/bin/perl

...
foreach $rr (@authority) {
        print $rr->string, "\n";
        }
  2. or download this
    whiskey> ./sim5.pl happy.com
;; query(happy.com, NS)
...
ns7.walgreens.com.      172800  IN      A       204.15.116.132

Can't call method "authority" on an undefined value at ./sim5.pl line 
+16.