Matched pair

SELECT * FROM gallery2 WHERE topic_id="500018" UNION SELECT * FROM gallery2 WHERE topic_id="1202044" UNION SELECT * FROM gallery2 WHERE topic_id="589864" UNION SELECT * FROM gallery2 WHERE topic_id="1807610" UNION SELECT * FROM gallery2 WHERE topic_id="700295" UNION SELECT * FROM gallery2 WHERE topic_id="241893" UNION SELECT * FROM gallery2 WHERE topic_id="1492048" UNION SELECT * FROM gallery2 WHERE topic_id="744155" UNION SELECT * FROM gallery2 WHERE topic_id="1060441" UNION SELECT * FROM gallery2 WHERE topic_id="749060" UNION SELECT * FROM gallery2 WHERE topic_id="1321432" UNION SELECT * FROM gallery2 WHERE topic_id="430717" UNION SELECT * FROM gallery2 WHERE topic_id="69346" UNION SELECT * FROM gallery2 WHERE topic_id="1586966" UNION SELECT * FROM gallery2 WHERE topic_id="496081" UNION SELECT * FROM gallery2 WHERE topic_id="528763"