{TAIL ~ A pack} containing {HEAD ~ an article} such as a bar of soap consists of an inner tubular liner within an outer wrapper 
{ TAIL ~ A pack } containing { HEAD ~ an article } such as a bar of soap consists of an inner tubular liner within an outer wrapper
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH