instruction: until 2102 what were the four most common lab tests?
response: SELECT d_labitems.label FROM d_labitems WHERE d_labitems.itemid IN (SELECT t1.itemid FROM (SELECT labevents.itemid, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM labevents WHERE STRFTIME('%y', labevents.charttime) <= '2102' GROUP BY labevents.itemid) AS t1 WHERE t1.c1 <= 4)