tell me the total amount of ultrafiltrate ultrafiltrate that patient 25523 produced on 06/06/2104?
select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25523 ) ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'ultrafiltrate ultrafiltrate' and d_items.linksto = 'outputevents' ) and strftime('%y-%m-%d',outputevents.charttime) = '2104-06-06'