{HEAD ~ One end} of {TAIL ~ the tube} 45 is in communication with one end of the tube 46, the other end of the tube 46 is in communication with one end of the tube 48, and the other end of the tube 48 is in communication with one end of the tube 50 
of
{ HEAD ~ One end } of { TAIL ~ the tube } 45 is in communication with one end of the tube 46 , the other end of the tube 46 is in communication with one end of the tube 48 , and the other end of the tube 48 is in communication with one end of the tube 50
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH