Actor-Director Duos with 3+ Films
Find pairs of (actor_id, director_id) who collaborated at least 3 times.
Expected output sample
This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.
| actor_id | director_id |
|---|---|
| 1 | 1 |
| 3 | 2 |
| 2 | 1 |
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