my @array_one = (1, 2, 3);
  my @array_two = (3, 4, 5);
  my %hash = (one => \@array_one,
              two => \@array_two);
  my $ref = \%hash;

##</code><code>##

  my $ref = {one => [ 1, 2, 3 ],
             two => [ 3, 4, 5 ]};