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  1. or download this
    $rh_dtree = {
             'L1' => {
...
                      'L3a' => {}
                    }
        };
  2. or download this
    
Main();
...
    @$ra_keys = ();
    
}
  3. or download this
    L2b.L2b1
L2b.L2b1.L2b2
...
L2b.L2b1.L2b2.L2a.L3b.L4a.L3a
L2b.L2b1.L2b2.L2a.L3b.L4a.L3a
  4. or download this
    nested-L2b
nested-L2b.nested-L2b1
...
nested-L2a.nested-L3b
nested-L2a.nested-L3b.nested-L4a
nested-L2a.nested-L3a