Find actors duets

Find acting duos who have appeared together in more than five films.
Output the result as a table with columns: 
    - actor_id, first_name, last_name - identifier, first and last name of the first actor, 
    - actor_id, first_name, last_name - identifier, first and last name of the second actor,
    - films_together - the number of films in which they starred together.

In each line, we first display the actor with the last name higher in alphabetical order. Sort the results in descending order of number of collaborations, then by the last name of the first actor.