Ruwiki ownerless pages in the user space

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SQL

USE ruwiki_p;
SELECT
  page_namespace,
  page_title,
  page_len
FROM page
LEFT JOIN `user`
ON user_name = REPLACE(page_title, '_', ' ')
WHERE page_namespace IN (2,3)
AND page_is_redirect = 0
AND page_title NOT LIKE "%/%"
AND page_title NOT RLIKE "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"
AND user_name IS NULL;

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