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