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use Tree::DAG_Node;
use Data::Dumper;
...
});

$root->delete_tree();

permit ip any any
  permit ip 10.0.0.0/8 172.16.0.0/16
    permit ip 10.0.0.0/16 172.16.0.0/24
  permit ip 192.168.0.0/16 12.16.0.0/24

root > A > B > C

[A,C,B]

root
 A
  C
  B

root
 A
  B
   C