follow the clues

SELECT * FROM gallery2 WHERE topic_id="1712548" UNION SELECT * FROM gallery2 WHERE topic_id="1420624" UNION SELECT * FROM gallery2 WHERE topic_id="115179" UNION SELECT * FROM gallery2 WHERE topic_id="1044498" UNION SELECT * FROM gallery2 WHERE topic_id="1708882" UNION SELECT * FROM gallery2 WHERE topic_id="386166" UNION SELECT * FROM gallery2 WHERE topic_id="1717516" UNION SELECT * FROM gallery2 WHERE topic_id="1643143" UNION SELECT * FROM gallery2 WHERE topic_id="1709453" UNION SELECT * FROM gallery2 WHERE topic_id="523055" UNION SELECT * FROM gallery2 WHERE topic_id="1108744" UNION SELECT * FROM gallery2 WHERE topic_id="1706446" UNION SELECT * FROM gallery2 WHERE topic_id="969622" UNION SELECT * FROM gallery2 WHERE topic_id="801543" UNION SELECT * FROM gallery2 WHERE topic_id="1143677" UNION SELECT * FROM gallery2 WHERE topic_id="822849"