dropping said activated chemical test pad in the water in the toilet bowl to come into {HEAD ~ contact} with occult blood in {TAIL ~ the toilet bowl} containing the fecal material to be tested; and 
dropping said activated chemical test pad in the water in the toilet bowl to come into { HEAD ~ contact } with occult blood in { TAIL ~ the toilet bowl } containing the fecal material to be tested ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH