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