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