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