what is the first time patient 83894 was admitted through the phys referral/normal deli to the hospital in 2102?
select admissions.admittime from admissions where admissions.subject_id = 83894 and admissions.admission_location = 'phys referral/normal deli' and strftime('%y',admissions.admittime) = '2102' order by admissions.admittime asc limit 1