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SELECT page.page_id, page.page_title, CategoriesQuery.SubcatLevel1, CategoriesQuery.SubcatLevel2, CategoriesQuery.SubcatLevel3, ROW_NUMBER() OVER (PARTITION BY page.page_title) AS RowNumber FROM ( SELECT categorylinks.cl_from, page.page_title as SubcatLevel3, LEVEL2.SubcatLevel2 as SubcatLevel2, LEVEL2.SubcatLevel1 as SubcatLevel1 FROM ( SELECT categorylinks.cl_from, page.page_title as SubcatLevel2, LEVEL1.SubCat as SubcatLevel1 FROM ( SELECT categorylinks.cl_from, categorylinks.cl_to, categorylinks.cl_type, page.page_title as SubCat FROM categorylinks INNER JOIN page ON categorylinks.cl_from = page.page_id WHERE cl_to = 'Mathematics' AND categorylinks.cl_type = 'subcat' ) AS LEVEL1 INNER JOIN categorylinks ON categorylinks.cl_to = LEVEL1.Subcat INNER JOIN page ON categorylinks.cl_from = page.page_id WHERE categorylinks.cl_type = 'subcat' ) AS LEVEL2 INNER JOIN categorylinks ON categorylinks.cl_to = LEVEL2.SubcatLevel2 INNER JOIN page ON categorylinks.cl_from = page.page_id WHERE categorylinks.cl_type = 'subcat' ) AS CategoriesQuery INNER JOIN categorylinks ON categorylinks.cl_to = CategoriesQuery.SubcatLevel1 OR categorylinks.cl_to = CategoriesQuery.SubcatLevel2 OR categorylinks.cl_to = CategoriesQuery.SubcatLevel3 OR categorylinks.cl_to = 'Mathematics' INNER JOIN page ON categorylinks.cl_from = page.page_id WHERE categorylinks.cl_type = 'page' AND LENGTH(page.page_title) > 3 AND page.page_title NOT LIKE '^%[a-z]%' LIMIT 10;
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