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Omphalographer
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EXPLAIN SELECT COUNT(*) FROM categorylinks p2s JOIN page s ON (p2s.cl_from = s.page_id) JOIN categorylinks s2f ON (s.page_title = s2f.cl_to) JOIN page f ON (f.page_title = s2f.cl_from) WHERE p2s.cl_to IN ( 'Photographs_by_F-number', -- 'Photographs_by_ISO_speed_rating', -- 'Photographs_by_aspect_ratio', -- 'Photographs_by_exposure_time', -- 'Photographs_by_lens_focal_length' ) AND s.page_namespace = 14 -- category AND f.page_namespace = 6 -- file
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