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Nikki
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SQL
USE wikidatawiki_p; SELECT term_text, group_concat(distinct term_entity_id), count(*) as c FROM wb_terms WHERE term_language = 'en' AND term_type = 'label' AND term_entity_type = 'item' AND term_text REGEXP '^Category:(January|February|March|April|May|June|July|August|September|October|November|December) [0-9]{4}$' group by term_text having count(distinct term_entity_id) > 1;
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