Before I use to countfreq for an element using

        $Elementsfreq{$Element}++;

Now to increment the count, do I have to have another variable?, Could you please tell me what is wrong with the following?:

$countElements++;
%Elementsfreq =  ($Element => [$countElements, [ 0..$index ] ]);
$bigramfrequency{$bigram}[0]++;
$bigramfrequency{$bigram}[1][$position]++;