{HEAD ~ A third flow path}, parallel to {TAIL ~ the first two flow paths}, may be provided with throttling apparatus for controlled communication of fluid along such third flow path 
{ HEAD ~ A third flow path } , parallel to { TAIL ~ the first two flow paths } , may be provided with throttling apparatus for controlled communication of fluid along such third flow path
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH