 from {HEAD ~ about 5 weight percent} to {TAIL ~ about 30 weight percent} of polypropylene; and 
to
from { HEAD ~ about 5 weight percent } to { TAIL ~ about 30 weight percent } of polypropylene ; and
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH