A breakable membrane, such as {HEAD ~ a piercable foil}, extends within the container and separates {TAIL ~ the two chambers} 
A breakable membrane , such as { HEAD ~ a piercable foil } , extends within the container and separates { TAIL ~ the two chambers }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL