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    word    occurrence
 a        2
 b        4
...
 f        2
 g        4
 h        3
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    Freq.of occurrence    freq_count
         0            0
         1            2
...
         4            2
         5            0
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    if(exists($count{$word})){
        $occurence = $count{$word};
                freq_count++;
        }