Frequently hard

SELECT * FROM gallery2 WHERE topic_id="1597979" UNION SELECT * FROM gallery2 WHERE topic_id="213096" UNION SELECT * FROM gallery2 WHERE topic_id="512889" UNION SELECT * FROM gallery2 WHERE topic_id="1064188" UNION SELECT * FROM gallery2 WHERE topic_id="1155731" UNION SELECT * FROM gallery2 WHERE topic_id="1190178" UNION SELECT * FROM gallery2 WHERE topic_id="629856" UNION SELECT * FROM gallery2 WHERE topic_id="647701" UNION SELECT * FROM gallery2 WHERE topic_id="242817" UNION SELECT * FROM gallery2 WHERE topic_id="1329110" UNION SELECT * FROM gallery2 WHERE topic_id="795108" UNION SELECT * FROM gallery2 WHERE topic_id="263975" UNION SELECT * FROM gallery2 WHERE topic_id="948144" UNION SELECT * FROM gallery2 WHERE topic_id="1400662" UNION SELECT * FROM gallery2 WHERE topic_id="1291758" UNION SELECT * FROM gallery2 WHERE topic_id="1662837"