The liquid reagent 17 is then squirted directly onto the portion of {HEAD ~ the test pad} 12 bearing {TAIL ~ the first reagent} 13 
bearing
The liquid reagent 17 is then squirted directly onto the portion of { HEAD ~ the test pad } 12 bearing { TAIL ~ the first reagent } 13
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH