a plurality of {TAIL ~ electrodes} in an array and adapted to be in electrical contact with {HEAD ~ the body} 
a plurality of { TAIL ~ electrodes } in an array and adapted to be in electrical contact with { HEAD ~ the body }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD