Articles, e.g. {HEAD ~ inflated sports balls} made of these alloys of polyurethanes and rubbers have {TAIL ~ surprisingly low air permeability} and improved resiliency 
have
Articles , e.g. { HEAD ~ inflated sports balls } made of these alloys of polyurethanes and rubbers have { TAIL ~ surprisingly low air permeability } and improved resiliency
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH