was the red blood cells value of patient 52647 measured at 2103-05-22 06:40:00 greater than the value measured at 2103-05-20 06:55:00?
select ( select labevents.valuenum from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 52647 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'red blood cells' ) and labevents.charttime = '2103-05-22 06:40:00' ) > ( select labevents.valuenum from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 52647 ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'red blood cells' ) and labevents.charttime = '2103-05-20 06:55:00' )