$VAR1 = {
          'L1_counter1' => 1,
          'nested1' => {
                         'L2_counter1' => 3
                       }
        };
Starting task 1 for L1_counter1
Starting task 3 for L2_counter1
Finished task 1 for L1_counter1
Finished task 3 for L2_counter1

$VAR1 = {
          'nested1' => {
                         'L2_counter1' => 4
                       },
          'L1_counter1' => 2
        };