{HEAD ~ A fluid sample} is brought into {TAIL ~ contact} with a pair of spaced apart electrodes and a voltage is applied across the electrodes 
is brought into
{ HEAD ~ A fluid sample } is brought into { TAIL ~ contact } with a pair of spaced apart electrodes and a voltage is applied across the electrodes
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH