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