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WITH base_table AS ( SELECT DISTINCT rev_id, rev_actor, rev_timestamp, rev_len, rev_parent_id, page_namespace, page_id, actor_id, REGEXP_SUBSTR(page_title, 'W[a-z]/[a-z]+') AS prefix FROM revision rev JOIN page ON rev.rev_page = page.page_id JOIN actor ON rev.rev_actor = actor.actor_id ORDER BY rev_id DESC), actor_table AS ( SELECT prefix, COUNT(DISTINCT actor_id) AS actor_count FROM base_table GROUP BY prefix) SELECT * FROM base_table ORDER BY rev_timestamp LIMIT 10
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