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