print Dumper \@AoH;

__END__
(it's an AoHoH ... not an AoHoAoH)
$VAR1 = [
          {
            'page' => {
                        'paragraph' => 'lesson1'
                      },
            'chapter' => 'Basic',
            'HASH(0x8638dec)' => undef
          },
          {
            'HASH(0x86fee04)' => undef,
            'page' => {
                        'paragraph' => 'lesson3'
                      },
            'chapter' => 'Advanced'
          }
        ];