instruction: since 2104, what was the three most commonly taken lab tests for patients with the age of 30s?
response: SELECT t1.labname FROM (SELECT lab.labname, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM lab WHERE lab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.age BETWEEN 30 AND 39) AND STRFTIME('%y', lab.labresulttime) >= '2104' GROUP BY lab.labname) AS t1 WHERE t1.c1 <= 3