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