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