{HEAD ~ A process} for the manufacture of pipes, comprising extruding {TAIL ~ an ethylene polymer composition} 1 
comprising extruding
{ HEAD ~ A process } for the manufacture of pipes , comprising extruding { TAIL ~ an ethylene polymer composition } 1
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH