instruction: until 1 year ago, what were the four most common input events?
response: SELECT d_items.label FROM d_items WHERE d_items.itemid IN (SELECT t1.itemid FROM (SELECT inputevents_cv.itemid, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM inputevents_cv WHERE DATETIME(inputevents_cv.charttime) <= DATETIME(CURRENT_TIME(), '-1 year') GROUP BY inputevents_cv.itemid) AS t1 WHERE t1.c1 <= 4)