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