a reservoir connected in common to said flow systems to receive {HEAD ~ a flow} of fluid from {TAIL ~ each said system} 
from
a reservoir connected in common to said flow systems to receive { HEAD ~ a flow } of fluid from { TAIL ~ each said system }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL