coating {HEAD ~ the walls} of the cavity with a coating material by depositing coating material in the cavity, closing off the cavity, and rotating the stack of base sheets in such a way that the coating material flows around and progressively coats the walls of {TAIL ~ the cavity}; and 
coating { HEAD ~ the walls } of the cavity with a coating material by depositing coating material in the cavity , closing off the cavity , and rotating the stack of base sheets in such a way that the coating material flows around and progressively coats the walls of { TAIL ~ the cavity } ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH