SELECT DISTINCT e1.page_title
FROM   enwiktstruct AS e1
       INNER JOIN categorylinks
         ON e1.page_id = cl_from
            AND e1.lang_id = 0
            AND e1.head_id IS NULL
            AND cl_to = 'English_interjections'
       LEFT JOIN enwiktstruct AS e2
         ON e1.page_id = e2.page_id
            AND e1.lang_id = e2.lang_id
            AND e2.head_id = 29
WHERE  e2.head_id IS NULL

UNION

SELECT   DISTINCT e1.page_title
FROM     enwiktstruct e1
         INNER JOIN enwiktstruct AS e2
           ON e1.page_id = e2.page_id
              AND e1.lang_id = 0
              AND e1.lang_id = e2.lang_id
              AND e1.head_id = 29
              AND e1.head_id = e2.head_id
         LEFT JOIN categorylinks
           ON e2.page_id = cl_from
              AND cl_to = 'English_interjections'
WHERE    cl_to IS NULL
ORDER BY page_title;