{HEAD ~ The counter force} of {TAIL ~ the vacuum} resists tissue movement in the direction of electrode penetration 
of
{ HEAD ~ The counter force } of { TAIL ~ the vacuum } resists tissue movement in the direction of electrode penetration
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH