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  1. or download this
    $hash{$word1}{$word2}{$word3} = $count
  2. or download this
    $hash{$word1}{$word2}{$word3} =
    { count => $count,
      freq  => $frequency }
  3. or download this
    $hash{$word1}{$word2} =
    {
...
                     $word3 => $count,
                 }
    }
  4. or download this
    $hash{$word1}{$word2}{total_counts}++;
$hash{$word1}{$word2}{words}{$word3}++;