Squeeze them

SELECT * FROM gallery2 WHERE topic_id="1342267" UNION SELECT * FROM gallery2 WHERE topic_id="1461904" UNION SELECT * FROM gallery2 WHERE topic_id="1227766" UNION SELECT * FROM gallery2 WHERE topic_id="1601718" UNION SELECT * FROM gallery2 WHERE topic_id="1112445" UNION SELECT * FROM gallery2 WHERE topic_id="126653" UNION SELECT * FROM gallery2 WHERE topic_id="1336732" UNION SELECT * FROM gallery2 WHERE topic_id="747785" UNION SELECT * FROM gallery2 WHERE topic_id="421316" UNION SELECT * FROM gallery2 WHERE topic_id="1547611" UNION SELECT * FROM gallery2 WHERE topic_id="1685749" UNION SELECT * FROM gallery2 WHERE topic_id="1734226" UNION SELECT * FROM gallery2 WHERE topic_id="399995" UNION SELECT * FROM gallery2 WHERE topic_id="1070875" UNION SELECT * FROM gallery2 WHERE topic_id="122251" UNION SELECT * FROM gallery2 WHERE topic_id="441613"