$href->{p=root}{cp=1} = 'entry1'
$href->{p=root}{cp=1}{n=1} = 'entry11'

##</code><code>##

$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=1'}{'n=1'} = 'entry1111';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=1'}{'n=2'} = 'entry1112';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=1'}{'n=3'} = 'entry1113';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=2'}{'n=1'} = 'entry1121';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=2'}{'n=2'} = 'entry1122';
$href->{'p=root'}{'cp=1'}{'n=1'}{'n=1'}{'n=2'}{'n=3'} = 'entry1123';

# Let's see what we got:
use Data::Dumper; $Data::Dumper::Indent = 1;
print Dumper $href;

##</code><code>##

$VAR1 = {
  'p=root' => {
    'cp=1' => {
      'n=1' => {
        'n=1' => {
          'n=1' => {
            'n=1' => 'entry1111',
            'n=2' => 'entry1112',
            'n=3' => 'entry1113'
          },
          'n=2' => {
            'n=1' => 'entry1121',
            'n=2' => 'entry1122',
            'n=3' => 'entry1123'
          }
        }
      }
    }
  }
};