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The result is something like $VAR1->{'1'}{'test2'}.

$VAR2 = {
          '2' => {
                   'test1' => {
                                '1' => $VAR1->{'1'}{'test1'},
                                ...

$VAR1 = {
          '2' => {
...
                                         'key3' => '3'
                                       },
                                ...