At no time in this procedure are the banknotes out of {HEAD ~ contact} with {TAIL ~ the forces} which hold them together 
At no time in this procedure are the banknotes out of { HEAD ~ contact } with { TAIL ~ the forces } which hold them together
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH