an additive product in {TAIL ~ said chamber} for adding to said container after {HEAD ~ at least part} of said membrane is severed 
an additive product in { TAIL ~ said chamber } for adding to said container after { HEAD ~ at least part } of said membrane is severed
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH