{TAIL ~ The structure} includes a body for extending around the container opening and a membrane for occluding {HEAD ~ the container opening} 
{ TAIL ~ The structure } includes a body for extending around the container opening and a membrane for occluding { HEAD ~ the container opening }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD