{TAIL ~ Electrode pairs} to which {HEAD ~ the first voltage} is not applied may receive the second voltage earlier than the other electrode pairs 
to is not applied
{ TAIL ~ Electrode pairs } to which { HEAD ~ the first voltage } is not applied may receive the second voltage earlier than the other electrode pairs
TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH