The completed safety line has a film applied to {HEAD ~ the exterior} thereof to prevent {TAIL ~ surface wetting} 
to prevent
The completed safety line has a film applied to { HEAD ~ the exterior } thereof to prevent { TAIL ~ surface wetting }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL