Frequently hard

SELECT * FROM gallery2 WHERE topic_id="584997" UNION SELECT * FROM gallery2 WHERE topic_id="1731189" UNION SELECT * FROM gallery2 WHERE topic_id="618108" UNION SELECT * FROM gallery2 WHERE topic_id="682457" UNION SELECT * FROM gallery2 WHERE topic_id="1332055" UNION SELECT * FROM gallery2 WHERE topic_id="209198" UNION SELECT * FROM gallery2 WHERE topic_id="596835" UNION SELECT * FROM gallery2 WHERE topic_id="256985" UNION SELECT * FROM gallery2 WHERE topic_id="117670" UNION SELECT * FROM gallery2 WHERE topic_id="355006" UNION SELECT * FROM gallery2 WHERE topic_id="1464776" UNION SELECT * FROM gallery2 WHERE topic_id="645852" UNION SELECT * FROM gallery2 WHERE topic_id="536224" UNION SELECT * FROM gallery2 WHERE topic_id="331956" UNION SELECT * FROM gallery2 WHERE topic_id="1650053" UNION SELECT * FROM gallery2 WHERE topic_id="398724"