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SELECT link_href FROM linkbuilding_registry JOIN linkbuilding_sites ON linkbuilding_registry.site_id = linkbuilding_sites.id JOIN linkchecker_registry ON linkbuilding_registry.id = linkchecker_registry.linkbuilding_registry_id where linkchecker_registry.updated_at <= '2018-02-01' AND linkchecker_registry.updated_at <= '2018-02-28' AND linkchecker_registry.status = 2 ORDER BY RAND() LIMIT 300