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            "title": "Actors and Directors Who Cooperated At Least Three Times",
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            "content": "<p>Table: <code>ActorDirector</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type    |\n+-------------+---------+\n| actor_id    | int     |\n| director_id | int     |\n| timestamp   | int     |\n+-------------+---------+\ntimestamp is the primary key (column with unique values) for this table.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write a solution to find all the pairs <code>(actor_id, director_id)</code> where the actor has cooperated with the director at least three times.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nActorDirector table:\n+-------------+-------------+-------------+\n| actor_id    | director_id | timestamp   |\n+-------------+-------------+-------------+\n| 1           | 1           | 0           |\n| 1           | 1           | 1           |\n| 1           | 1           | 2           |\n| 1           | 2           | 3           |\n| 1           | 2           | 4           |\n| 2           | 1           | 5           |\n| 2           | 1           | 6           |\n+-------------+-------------+-------------+\n<strong>Output:</strong> \n+-------------+-------------+\n| actor_id    | director_id |\n+-------------+-------------+\n| 1           | 1           |\n+-------------+-------------+\n<strong>Explanation:</strong> The only pair is (1, 1) where they cooperated exactly 3 times.\n</pre>\n",
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                "insert into ActorDirector (actor_id, director_id, timestamp) values ('1', '1', '0')",
                "insert into ActorDirector (actor_id, director_id, timestamp) values ('1', '1', '1')",
                "insert into ActorDirector (actor_id, director_id, timestamp) values ('1', '1', '2')",
                "insert into ActorDirector (actor_id, director_id, timestamp) values ('1', '2', '3')",
                "insert into ActorDirector (actor_id, director_id, timestamp) values ('1', '2', '4')",
                "insert into ActorDirector (actor_id, director_id, timestamp) values ('2', '1', '5')",
                "insert into ActorDirector (actor_id, director_id, timestamp) values ('2', '1', '6')"
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