{HEAD ~ A conduit} is provided between {TAIL ~ the cannisters}, and a quantity of volatile fluid is located in the cannisters and conduit 
is provided between
{ HEAD ~ A conduit } is provided between { TAIL ~ the cannisters } , and a quantity of volatile fluid is located in the cannisters and conduit
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH