{TAIL ~ These interconnect materials} include doped polysilicon, polycides, and {HEAD ~ tungsten metal} 
{ TAIL ~ These interconnect materials } include doped polysilicon , polycides , and { HEAD ~ tungsten metal }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD