{HEAD ~ The other end} of the tube 45 is in communication with one end of the tube 47, the other end of the tube 47 is in communication with one end of the tube 49, and the other end of the tube 49 is in communication with the other end of {TAIL ~ the tube} 50 
{ HEAD ~ The other end } of the tube 45 is in communication with one end of the tube 47 , the other end of the tube 47 is in communication with one end of the tube 49 , and the other end of the tube 49 is in communication with the other end of { TAIL ~ the tube } 50
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH