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