USE dewiki_p;

SELECT DISTINCT

  cl_to

FROM categorylinks AS cat

JOIN page AS pg1

ON cat.cl_from = pg1.page_id

WHERE page_namespace = 2

AND EXISTS (SELECT

              1

            FROM page AS pg2

            JOIN categorylinks AS cl

            ON pg2.page_id = cl.cl_from

            WHERE pg2.page_namespace = 0

            AND cat.cl_to = cl.cl_to)

AND cl_to NOT IN (SELECT

                    page_title

                  FROM page

                  JOIN templatelinks

                  ON tl_from = page_id

                  WHERE page_namespace = 14

                  AND tl_namespace = 10

                  AND tl_title = 'Pollutedcat')

LIMIT 250;