{HEAD ~ Each} of the gas supply nozzles may branch of {TAIL ~ a single supply line} connected to a single source gas supply 
branch of
{ HEAD ~ Each } of the gas supply nozzles may branch of { TAIL ~ a single supply line } connected to a single source gas supply
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH