{TAIL ~ The coated ceramic bodies} are then heated to cause {HEAD ~ diffusion} of the insulating substances throughout their intergranular boundaries 
{ TAIL ~ The coated ceramic bodies } are then heated to cause { HEAD ~ diffusion } of the insulating substances throughout their intergranular boundaries
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH