What do you think?

SELECT * FROM gallery2 WHERE topic_id="1550667" UNION SELECT * FROM gallery2 WHERE topic_id="805534" UNION SELECT * FROM gallery2 WHERE topic_id="739774" UNION SELECT * FROM gallery2 WHERE topic_id="1420007" UNION SELECT * FROM gallery2 WHERE topic_id="275380" UNION SELECT * FROM gallery2 WHERE topic_id="1545146" UNION SELECT * FROM gallery2 WHERE topic_id="1618051" UNION SELECT * FROM gallery2 WHERE topic_id="644821" UNION SELECT * FROM gallery2 WHERE topic_id="897838" UNION SELECT * FROM gallery2 WHERE topic_id="763703" UNION SELECT * FROM gallery2 WHERE topic_id="1437340" UNION SELECT * FROM gallery2 WHERE topic_id="475210" UNION SELECT * FROM gallery2 WHERE topic_id="1819934" UNION SELECT * FROM gallery2 WHERE topic_id="579655" UNION SELECT * FROM gallery2 WHERE topic_id="1437811" UNION SELECT * FROM gallery2 WHERE topic_id="835629"