since 2101, what are the top four most frequently ordered laboratory tests for patients during the same month after they have been diagnosed with ac dvt/emb distl low ext?
select d_labitems.label from d_labitems where d_labitems.itemid in ( select t3.itemid from ( select t2.itemid, dense_rank() over ( order by count(*) desc ) as c1 from ( select admissions.subject_id, diagnoses_icd.charttime from diagnoses_icd join admissions on diagnoses_icd.hadm_id = admissions.hadm_id where diagnoses_icd.icd9_code = ( select d_icd_diagnoses.icd9_code from d_icd_diagnoses where d_icd_diagnoses.short_title = 'ac dvt/emb distl low ext' ) and strftime('%y',diagnoses_icd.charttime) >= '2101' ) as t1 join ( select admissions.subject_id, labevents.itemid, labevents.charttime from labevents join admissions on labevents.hadm_id = admissions.hadm_id where strftime('%y',labevents.charttime) >= '2101' ) as t2 on t1.subject_id = t2.subject_id where t1.charttime < t2.charttime and datetime(t1.charttime,'start of month') = datetime(t2.charttime,'start of month') group by t2.itemid ) as t3 where t3.c1 <= 4 )