{TAIL ~ a second opposing electrode} arranged in {HEAD ~ opposition} to the second voltage application electrode; and 
{ TAIL ~ a second opposing electrode } arranged in { HEAD ~ opposition } to the second voltage application electrode ; and
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH