{HEAD ~ A complete roll} of {TAIL ~ wrapping material} comprises several wrapping portions, which are held and released at their lateral ends 
of
{ HEAD ~ A complete roll } of { TAIL ~ wrapping material } comprises several wrapping portions , which are held and released at their lateral ends
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