Imagine that

SELECT * FROM gallery2 WHERE topic_id="827016" UNION SELECT * FROM gallery2 WHERE topic_id="454440" UNION SELECT * FROM gallery2 WHERE topic_id="1733728" UNION SELECT * FROM gallery2 WHERE topic_id="657658" UNION SELECT * FROM gallery2 WHERE topic_id="1059932" UNION SELECT * FROM gallery2 WHERE topic_id="346445" UNION SELECT * FROM gallery2 WHERE topic_id="461285" UNION SELECT * FROM gallery2 WHERE topic_id="193601" UNION SELECT * FROM gallery2 WHERE topic_id="807754" UNION SELECT * FROM gallery2 WHERE topic_id="732837" UNION SELECT * FROM gallery2 WHERE topic_id="553879" UNION SELECT * FROM gallery2 WHERE topic_id="1792249" UNION SELECT * FROM gallery2 WHERE topic_id="427831" UNION SELECT * FROM gallery2 WHERE topic_id="1478185" UNION SELECT * FROM gallery2 WHERE topic_id="1084046" UNION SELECT * FROM gallery2 WHERE topic_id="1144681"