what is the name of a drug patient 94229 had been prescribed two times in the current hospital encounter?
select t1.drug from ( select prescriptions.drug, count( prescriptions.startdate ) as c1 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 94229 and admissions.dischtime is null ) group by prescriptions.drug ) as t1 where t1.c1 = 2