{HEAD ~ The hot water} in the tank is maintained at {TAIL ~ a constant level} so that the quantity of water discharged by the dipper is fixed 
is maintained at
{ HEAD ~ The hot water } in the tank is maintained at { TAIL ~ a constant level } so that the quantity of water discharged by the dipper is fixed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH