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        my %category_count;
        
        sub handle_article {
            my ($path, $category, $article_body) = @_;
            ...
            # lots of stuff
            ...
            
            # count number of articles in each category
            $category_count{ $category }++;
        }

Oops, it turns out that the counts are wrong!

Because handle_article is called more than once for each article!


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