Which should come off first?😈

SELECT * FROM gallery2 WHERE topic_id="249491" UNION SELECT * FROM gallery2 WHERE topic_id="1705813" UNION SELECT * FROM gallery2 WHERE topic_id="843760" UNION SELECT * FROM gallery2 WHERE topic_id="63306" UNION SELECT * FROM gallery2 WHERE topic_id="121443" UNION SELECT * FROM gallery2 WHERE topic_id="729072" UNION SELECT * FROM gallery2 WHERE topic_id="1338039" UNION SELECT * FROM gallery2 WHERE topic_id="1044675" UNION SELECT * FROM gallery2 WHERE topic_id="1389292" UNION SELECT * FROM gallery2 WHERE topic_id="991803" UNION SELECT * FROM gallery2 WHERE topic_id="787303" UNION SELECT * FROM gallery2 WHERE topic_id="1614355" UNION SELECT * FROM gallery2 WHERE topic_id="145840" UNION SELECT * FROM gallery2 WHERE topic_id="434795" UNION SELECT * FROM gallery2 WHERE topic_id="761270" UNION SELECT * FROM gallery2 WHERE topic_id="1005540"