{HEAD ~ an outer tube} having {TAIL ~ first and second ends} and a lateral inlet near said first end, 
having
{ HEAD ~ an outer tube } having { TAIL ~ first and second ends } and a lateral inlet near said first end ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH