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with p as (Select f.title, f.film_id, a.first_name, a.last_name, a.actor_id from film as f join film_actor as fa on f.film_id = fa.film_id join actor as a on fa.actor_id = a.actor_id order by f.title asc) select count(group_concat(first_name, last_name)) from p group by film_id

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