The water transport unit includes {TAIL ~ first and second portions} in {HEAD ~ a manner} similar to that described previously 
The water transport unit includes { TAIL ~ first and second portions } in { HEAD ~ a manner } similar to that described previously
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH