{HEAD ~ A shut off member} is provided for {TAIL ~ each receiving container} of the preceding stage in the said channel 
{ HEAD ~ A shut off member } is provided for { TAIL ~ each receiving container } of the preceding stage in the said channel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH