my @one_d = ( (1,2,3), (4,5,6), (7,8,9) );

##</code><code>##

my @two_d = ( [1,2,3], [4,5,6], [7,8,9] );

##</code><code>##

my $two_d = [ [1,2,3], [4,5,6], [7,8,9] ];

##</code><code>##

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'
          }
        ];