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with t as ( select c.name category, f.title, count(1) as rentals_count, dense_rank() over(partition by c.name order by count(1) desc) as r from category c join film_category fc on c.category_id = fc.category_id join film f on fc.film_id = f.film_id join inventory i on f.film_id = i.film_id join rental r on i.inventory_id = r.inventory_id where r.rental_date like '2005%' group by c.name, f.title ) select category, group_concat(title) most_rented_films, rentals_count from t where r = 1 group by category, rentals_count

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