SQL
AخA
SELECT CONCAT(CASE page_namespace WHEN 4 THEN "Wikipedia:" ELSE "" END, page_title) as title
FROM page
WHERE page_title REGEXP "[Cc]olou?r" AND page_namespace IN (0, 4)
GROUP BY page_namespace, REPLACE(REPLACE(page_title,"colour","color"),"Colour","Color")
HAVING COUNT(*)=1
ORDER BY page_namespace, title
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