They’re natural, x:

SELECT * FROM gallery2 WHERE topic_id="1634797" UNION SELECT * FROM gallery2 WHERE topic_id="1356654" UNION SELECT * FROM gallery2 WHERE topic_id="1037289" UNION SELECT * FROM gallery2 WHERE topic_id="280998" UNION SELECT * FROM gallery2 WHERE topic_id="1823799" UNION SELECT * FROM gallery2 WHERE topic_id="1615480" UNION SELECT * FROM gallery2 WHERE topic_id="1224627" UNION SELECT * FROM gallery2 WHERE topic_id="864362" UNION SELECT * FROM gallery2 WHERE topic_id="1117945" UNION SELECT * FROM gallery2 WHERE topic_id="1788030" UNION SELECT * FROM gallery2 WHERE topic_id="758414" UNION SELECT * FROM gallery2 WHERE topic_id="242258" UNION SELECT * FROM gallery2 WHERE topic_id="1458260" UNION SELECT * FROM gallery2 WHERE topic_id="1261603" UNION SELECT * FROM gallery2 WHERE topic_id="317035" UNION SELECT * FROM gallery2 WHERE topic_id="954272"