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