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with v1 as (select category_id , film_id , count(rental_id) as co , rank() over(partition by category_id order by count(rental_id) desc) as ra from film_category join inventory using(film_id) join rental using(inventory_id) where year(rental_date) = 2005 group by category_id, film_id) select category_id , group_concat(film_id) from v1 where ra = 1 group by category_id

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