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