{HEAD ~ The stopper mechanism} is configured to control and release {TAIL ~ opening} of the openably closable unit 
is configured to release
{ HEAD ~ The stopper mechanism } is configured to control and release { TAIL ~ opening } of the openably closable unit
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH