{HEAD ~ The first polymer} contains {TAIL ~ a polymer} having at least 70% α olefin units and is characterized by a melting temperature lower than the melting temperature of the exterior surface portion of the core 
contains
{ HEAD ~ The first polymer } contains { TAIL ~ a polymer } having at least 70 % α olefin units and is characterized by a melting temperature lower than the melting temperature of the exterior surface portion of the core
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH