Furthermore, {HEAD ~ the present protective overcoats} have {TAIL ~ high density}, generally being over about 2.5 grams per cubic centimeter, and are also very chemically inert 
have
Furthermore , { HEAD ~ the present protective overcoats } have { TAIL ~ high density } , generally being over about 2.5 grams per cubic centimeter , and are also very chemically inert
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH