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use strict; use warnings; 
use Data::Dumper; 
...
  $node->{parent}=$parent;
  push @{$parent->{childs}},$node;
}

$VAR1 = {
  '1top' => {
...
  'child21' => $VAR1->{'1top'}{'childs'}[1]{'childs'}[0],
  'child22' => $VAR1->{'1top'}{'childs'}[1]{'childs'}[1]
};