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