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