For details please take a look at the provided link.

Karls-Mac-mini:Desktop karl$ ./hash_walk.pl
$VAR1 = {
          'c' => {
                   'ca' => 8,
                   'cb' => {
                             'cba' => 9,
                             'cbb' => 10
                           }
                 },
          'a' => {
                   'ab' => 1,
                   'ad' => {
                             'adb' => 4,
                             'ada' => 3,
                             'adc' => {
                                        'adcb' => 6,
                                        'adca' => 5
                                      }
                           },
                   'ac' => 2
                 },
          'b' => 7
        };
k = ca        v = 8     key_list = [c ca]
k = cba       v = 9     key_list = [c cb cba]
k = cbb       v = 10    key_list = [c cb cbb]
k = ab        v = 1     key_list = [a ab]
k = adb       v = 4     key_list = [a ad adb]
k = ada       v = 3     key_list = [a ad ada]
k = adcb      v = 6     key_list = [a ad adc adcb]
k = adca      v = 5     key_list = [a ad adc adca]
k = ac        v = 2     key_list = [a ac]
k = b         v = 7     key_list = [b]
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