$hash{$word1}{$word2}{$word3} = $count

##</code><code>##

$hash{$word1}{$word2}{$word3} =
    { count => $count,
      freq  => $frequency }

##</code><code>##

$hash{$word1}{$word2} =
    {
        total_counts => $tot_counts,
        words => {
                     $word3 => $count,
                 }
    }

##</code><code>##

$hash{$word1}{$word2}{total_counts}++;
$hash{$word1}{$word2}{words}{$word3}++;