{HEAD ~ A conduit} 78 interconnects cannisters 72, 74 at the bottom of {TAIL ~ one end} 
{ HEAD ~ A conduit } 78 interconnects cannisters 72 , 74 at the bottom of { TAIL ~ one end }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL