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