{HEAD ~ A canister} is connected with {TAIL ~ a fuel tank} to adsorb fuel vapor generated in the fuel tank 
is connected with
{ HEAD ~ A canister } is connected with { TAIL ~ a fuel tank } to adsorb fuel vapor generated in the fuel tank
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH