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Wikibase
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USE zhwiki_p; SELECT a.cl_from FROM (SELECT * FROM categorylinks WHERE cl_to = "合理使用图像" AND cl_type = "file") a LEFT JOIN (SELECT * FROM categorylinks WHERE cl_to = "正确回链的非自由图像" AND cl_type = "file") b ON a.cl_from = b.cl_from WHERE b.cl_from IS NULL GROUP BY a.cl_from
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