$VAR1 = {
          '6' => 4,
          '99' => -1,
          '4' => -1,
          '3' => 5,
          '2' => 6,
          '5' => -1
        };
$VAR1 = {
          '99' => -1,
          '3' => {
                   '5' => -1
                 },
          '2' => {
                   '6' => {
                            '4' => -1
                          }
                 }
        };