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