A test kit for preparing {HEAD ~ a chemical test pad} used in {TAIL ~ testing} for the presence of occult blood in a specimen 
used in
A test kit for preparing { HEAD ~ a chemical test pad } used in { TAIL ~ testing } for the presence of occult blood in a specimen
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH