{HEAD ~ a proximity sensor} in functional communication with said timing circuit and via said timing switch further in functional communication with said at least one pair of {TAIL ~ electrodes}; and 
{ HEAD ~ a proximity sensor } in functional communication with said timing circuit and via said timing switch further in functional communication with said at least one pair of { TAIL ~ electrodes } ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH