I need a bbc in between these

SELECT * FROM gallery2 WHERE topic_id="1817236" UNION SELECT * FROM gallery2 WHERE topic_id="297349" UNION SELECT * FROM gallery2 WHERE topic_id="1657087" UNION SELECT * FROM gallery2 WHERE topic_id="1451622" UNION SELECT * FROM gallery2 WHERE topic_id="992675" UNION SELECT * FROM gallery2 WHERE topic_id="501127" UNION SELECT * FROM gallery2 WHERE topic_id="414123" UNION SELECT * FROM gallery2 WHERE topic_id="876933" UNION SELECT * FROM gallery2 WHERE topic_id="1191339" UNION SELECT * FROM gallery2 WHERE topic_id="348122" UNION SELECT * FROM gallery2 WHERE topic_id="1527787" UNION SELECT * FROM gallery2 WHERE topic_id="797667" UNION SELECT * FROM gallery2 WHERE topic_id="754060" UNION SELECT * FROM gallery2 WHERE topic_id="1216780" UNION SELECT * FROM gallery2 WHERE topic_id="117516" UNION SELECT * FROM gallery2 WHERE topic_id="65702"