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