a) placing {TAIL ~ an aliquot} of sample onto {HEAD ~ a test element comprising}, in overlying relation, 
a ) placing { TAIL ~ an aliquot } of sample onto { HEAD ~ a test element comprising } , in overlying relation ,
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH