Let's do exercises

SELECT * FROM gallery2 WHERE topic_id="1556259" UNION SELECT * FROM gallery2 WHERE topic_id="1290532" UNION SELECT * FROM gallery2 WHERE topic_id="494136" UNION SELECT * FROM gallery2 WHERE topic_id="444192" UNION SELECT * FROM gallery2 WHERE topic_id="1001016" UNION SELECT * FROM gallery2 WHERE topic_id="1661549" UNION SELECT * FROM gallery2 WHERE topic_id="275090" UNION SELECT * FROM gallery2 WHERE topic_id="36747" UNION SELECT * FROM gallery2 WHERE topic_id="443034" UNION SELECT * FROM gallery2 WHERE topic_id="182774" UNION SELECT * FROM gallery2 WHERE topic_id="1535179" UNION SELECT * FROM gallery2 WHERE topic_id="79609" UNION SELECT * FROM gallery2 WHERE topic_id="1411154" UNION SELECT * FROM gallery2 WHERE topic_id="275092" UNION SELECT * FROM gallery2 WHERE topic_id="433554" UNION SELECT * FROM gallery2 WHERE topic_id="1448375"