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