{TAIL ~ an outer sealing member} extending from ends of {HEAD ~ the towers} and which covers the two openings, and 
{ TAIL ~ an outer sealing member } extending from ends of { HEAD ~ the towers } and which covers the two openings , and
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH